src/Postgres/Extensions.fs

@@ -133,6 +133,22 @@ module Extensions =
         member conn.patchByJsonPath tableName jsonPath (patch: 'TPatch) =
             WithProps.Patch.byJsonPath tableName jsonPath patch (Sql.existingConnection conn)
         
+        /// Remove fields from a document by the document's ID
+        member conn.removeFieldsById tableName (docId: 'TKey) fieldNames =
+            WithProps.RemoveFields.byId tableName docId fieldNames (Sql.existingConnection conn)
+        
+        /// Remove fields from documents via a comparison on a JSON field in the document
+        member conn.removeFieldsByField tableName field fieldNames =
+            WithProps.RemoveFields.byField tableName field fieldNames (Sql.existingConnection conn)
+        
+        /// Remove fields from documents via a JSON containment query (@>)
+        member conn.removeFieldsByContains tableName (criteria: 'TContains) fieldNames =
+            WithProps.RemoveFields.byContains tableName criteria fieldNames (Sql.existingConnection conn)
+        
+        /// Remove fields from documents via a JSON Path match query (@?)
+        member conn.removeFieldsByJsonPath tableName jsonPath fieldNames =
+            WithProps.RemoveFields.byJsonPath tableName jsonPath fieldNames (Sql.existingConnection conn)
+        
         /// Delete a document by its ID
         member conn.deleteById tableName (docId: 'TKey) =
             WithProps.Delete.byId tableName docId (Sql.existingConnection conn)
@@ -312,6 +328,26 @@ type NpgsqlConnectionCSharpExtensions =
     static member inline PatchByJsonPath(conn, tableName, jsonPath, patch: 'TPatch) =
         WithProps.Patch.byJsonPath tableName jsonPath patch (Sql.existingConnection conn)
     
+    /// Remove fields from a document by the document's ID
+    [<Extension>]
+    static member inline RemoveFieldsById(conn, tableName, docId: 'TKey, fieldNames) =
+        WithProps.RemoveFields.ById(tableName, docId, fieldNames, Sql.existingConnection conn)
+        
+    /// Remove fields from documents via a comparison on a JSON field in the document
+    [<Extension>]
+    static member inline RemoveFieldsByField(conn, tableName, field, fieldNames) =
+        WithProps.RemoveFields.ByField(tableName, field, fieldNames, Sql.existingConnection conn)
+        
+    /// Remove fields from documents via a JSON containment query (@>)
+    [<Extension>]
+    static member inline RemoveFieldsByContains(conn, tableName, criteria: 'TContains, fieldNames) =
+        WithProps.RemoveFields.ByContains(tableName, criteria, fieldNames, Sql.existingConnection conn)
+        
+    /// Remove fields from documents via a JSON Path match query (@?)
+    [<Extension>]
+    static member inline RemoveFieldsByJsonPath(conn, tableName, jsonPath, fieldNames) =
+        WithProps.RemoveFields.ByJsonPath(tableName, jsonPath, fieldNames, Sql.existingConnection conn)
+    
     /// Delete a document by its ID
     [<Extension>]
     static member inline DeleteById(conn, tableName, docId: 'TKey) =

src/Postgres/Library.fs

@@ -65,17 +65,27 @@ module Parameters =
 
     /// Create a JSON field parameter (name "@field")
     [<CompiledName "FSharpAddField">]
-    let addFieldParam field parameters =
+    let addFieldParam name field parameters =
         match field.Op with
         | EX | NEX -> parameters
-        | _ -> ("@field", Sql.parameter (NpgsqlParameter("@field", field.Value))) :: parameters
+        | _ -> (name, Sql.parameter (NpgsqlParameter(name, field.Value))) :: parameters
 
     /// Create a JSON field parameter (name "@field")
-    let AddField field parameters =
+    let AddField name field parameters =
         match field.Op with
         | EX | NEX -> parameters
-        | _ ->
+        | _ -> (name, Sql.parameter (NpgsqlParameter(name, field.Value))) |> Seq.singleton |> Seq.append parameters
-            ("@field", Sql.parameter (NpgsqlParameter("@field", field.Value))) |> Seq.singleton |> Seq.append parameters
+
+    /// Append JSON field name parameters for the given field names to the given parameters
+    [<CompiledName "FSharpFieldName">]
+    let fieldNameParam (fieldNames: string list) =
+        if fieldNames.Length = 1 then "@name", Sql.string fieldNames[0]
+        else "@name", Sql.stringArray (Array.ofList fieldNames)
+
+    /// Append JSON field name parameters for the given field names to the given parameters
+    let FieldName(fieldNames: string seq) =
+        if Seq.isEmpty fieldNames then "@name", Sql.string (Seq.head fieldNames)
+        else "@name", Sql.stringArray (Array.ofSeq fieldNames)
     
     /// An empty parameter sequence
     [<CompiledName "None">]
@@ -154,25 +164,56 @@ module Query =
     /// Queries to patch (partially update) documents
     module Patch =
 
+        /// Create an UPDATE statement to patch documents
+        let private update tableName whereClause =
+            $"UPDATE %s{tableName} SET data = data || @data WHERE {whereClause}"
+        
         /// Query to patch a document by its ID
         [<CompiledName "ById">]
         let byId tableName =
-            $"""UPDATE %s{tableName} SET data = data || @data WHERE {Query.whereById "@id"}"""
+            Query.whereById "@id" |> update tableName
         
         /// Query to patch documents match a JSON field comparison (->> =)
         [<CompiledName "ByField">]
         let byField tableName field =
-            $"""UPDATE %s{tableName} SET data = data || @data WHERE {Query.whereByField field "@field"}"""
+            Query.whereByField field "@field" |> update tableName
         
         /// Query to patch documents matching a JSON containment query (@>)
         [<CompiledName "ByContains">]
         let byContains tableName =
-            $"""UPDATE %s{tableName} SET data = data || @data WHERE {whereDataContains "@criteria"}"""
+            whereDataContains "@criteria" |> update tableName
 
         /// Query to patch documents matching a JSON containment query (@>)
         [<CompiledName "ByJsonPath">]
         let byJsonPath tableName =
-            $"""UPDATE %s{tableName} SET data = data || @data WHERE {whereJsonPathMatches "@path"}"""
+            whereJsonPathMatches "@path" |> update tableName
+
+    /// Queries to remove fields from documents
+    module RemoveFields =
+        
+        /// Create an UPDATE statement to remove parameters
+        let private update tableName whereClause =
+            $"UPDATE %s{tableName} SET data = data - @name WHERE {whereClause}"
+            
+        /// Query to remove fields from a document by the document's ID
+        [<CompiledName "ById">]
+        let byId tableName =
+            Query.whereById "@id" |> update tableName
+        
+        /// Query to remove fields from documents via a comparison on a JSON field within the document
+        [<CompiledName "ByField">]
+        let byField tableName field =
+            Query.whereByField field "@field" |> update tableName
+        
+        /// Query to patch documents matching a JSON containment query (@>)
+        [<CompiledName "ByContains">]
+        let byContains tableName =
+            whereDataContains "@criteria" |> update tableName
+
+        /// Query to patch documents matching a JSON containment query (@>)
+        [<CompiledName "ByJsonPath">]
+        let byJsonPath tableName =
+            whereJsonPathMatches "@path" |> update tableName
 
     /// Queries to delete documents
     module Delete =
@@ -312,7 +353,7 @@ module WithProps =
         /// Count matching documents using a JSON field comparison (->> =)
         [<CompiledName "ByField">]
         let byField tableName field sqlProps =
-            Custom.scalar (Query.Count.byField tableName field) (addFieldParam field []) toCount sqlProps
+            Custom.scalar (Query.Count.byField tableName field) (addFieldParam "@field" field []) toCount sqlProps
         
         /// Count matching documents using a JSON containment query (@>)
         [<CompiledName "ByContains">]
@@ -336,7 +377,7 @@ module WithProps =
         /// Determine if a document exists using a JSON field comparison (->> =)
         [<CompiledName "ByField">]
         let byField tableName field sqlProps =
-            Custom.scalar (Query.Exists.byField tableName field) (addFieldParam field []) toExists sqlProps
+            Custom.scalar (Query.Exists.byField tableName field) (addFieldParam "@field" field []) toExists sqlProps
         
         /// Determine if a document exists using a JSON containment query (@>)
         [<CompiledName "ByContains">]
@@ -373,11 +414,13 @@ module WithProps =
         /// Retrieve documents matching a JSON field comparison (->> =)
         [<CompiledName "FSharpByField">]
         let byField<'TDoc> tableName field sqlProps =
-            Custom.list<'TDoc> (Query.Find.byField tableName field) (addFieldParam field []) fromData<'TDoc> sqlProps
+            Custom.list<'TDoc>
+                (Query.Find.byField tableName field) (addFieldParam "@field" field []) fromData<'TDoc> sqlProps
         
         /// Retrieve documents matching a JSON field comparison (->> =)
         let ByField<'TDoc>(tableName, field, sqlProps) =
-            Custom.List<'TDoc>(Query.Find.byField tableName field, addFieldParam field [], fromData<'TDoc>, sqlProps)
+            Custom.List<'TDoc>(
+                Query.Find.byField tableName field, addFieldParam "@field" field [], fromData<'TDoc>, sqlProps)
         
         /// Retrieve documents matching a JSON containment query (@>)
         [<CompiledName "FSharpByContains">]
@@ -405,12 +448,18 @@ module WithProps =
         [<CompiledName "FSharpFirstByField">]
         let firstByField<'TDoc> tableName field sqlProps =
             Custom.single<'TDoc>
-                $"{Query.Find.byField tableName field} LIMIT 1" (addFieldParam field []) fromData<'TDoc> sqlProps
+                $"{Query.Find.byField tableName field} LIMIT 1"
+                (addFieldParam "@field" field [])
+                fromData<'TDoc>
+                sqlProps
             
         /// Retrieve the first document matching a JSON field comparison (->> =); returns null if not found
         let FirstByField<'TDoc when 'TDoc: null>(tableName, field, sqlProps) =
             Custom.Single<'TDoc>(
-                $"{Query.Find.byField tableName field} LIMIT 1", addFieldParam field [], fromData<'TDoc>, sqlProps)
+                $"{Query.Find.byField tableName field} LIMIT 1",
+                addFieldParam "@field" field [],
+                fromData<'TDoc>,
+                sqlProps)
             
         /// Retrieve the first document matching a JSON containment query (@>); returns None if not found
         [<CompiledName "FSharpFirstByContains">]
@@ -471,7 +520,9 @@ module WithProps =
         [<CompiledName "ByField">]
         let byField tableName field (patch: 'TPatch) sqlProps =
             Custom.nonQuery
-                (Query.Patch.byField tableName field) (addFieldParam field [ jsonParam "@data" patch ]) sqlProps
+                (Query.Patch.byField tableName field)
+                (addFieldParam "@field" field [ jsonParam "@data" patch ])
+                sqlProps
         
         /// Patch documents using a JSON containment query in the WHERE clause (@>)
         [<CompiledName "ByContains">]
@@ -485,6 +536,55 @@ module WithProps =
             Custom.nonQuery
                 (Query.Patch.byJsonPath tableName) [ jsonParam "@data" patch; "@path", Sql.string jsonPath ] sqlProps
 
+    /// Commands to remove fields from documents
+    [<RequireQualifiedAccess>]
+    module RemoveFields =
+        
+        /// Remove fields from a document by the document's ID
+        [<CompiledName "FSharpById">]
+        let byId tableName (docId: 'TKey) fieldNames sqlProps =
+            Custom.nonQuery (Query.RemoveFields.byId tableName) [ idParam docId; fieldNameParam fieldNames ] sqlProps
+        
+        /// Remove fields from a document by the document's ID
+        let ById(tableName, docId: 'TKey, fieldNames, sqlProps) =
+            byId tableName docId (List.ofSeq fieldNames) sqlProps
+        
+        /// Remove fields from documents via a comparison on a JSON field in the document
+        [<CompiledName "FSharpByField">]
+        let byField tableName field fieldNames sqlProps =
+            Custom.nonQuery
+                (Query.RemoveFields.byField tableName field)
+                (addFieldParam "@field" field [ fieldNameParam fieldNames ])
+                sqlProps
+        
+        /// Remove fields from documents via a comparison on a JSON field in the document
+        let ByField(tableName, field, fieldNames, sqlProps) =
+            byField tableName field (List.ofSeq fieldNames) sqlProps
+        
+        /// Remove fields from documents via a JSON containment query (@>)
+        [<CompiledName "FSharpByContains">]
+        let byContains tableName (criteria: 'TContains) fieldNames sqlProps =
+            Custom.nonQuery
+                (Query.RemoveFields.byContains tableName)
+                [ jsonParam "@criteria" criteria; fieldNameParam fieldNames ]
+                sqlProps
+    
+        /// Remove fields from documents via a JSON containment query (@>)
+        let ByContains(tableName, criteria: 'TContains, fieldNames, sqlProps) =
+            byContains tableName criteria (List.ofSeq fieldNames) sqlProps
+    
+        /// Remove fields from documents via a JSON Path match query (@?)
+        [<CompiledName "FSharpByJsonPath">]
+        let byJsonPath tableName jsonPath fieldNames sqlProps =
+            Custom.nonQuery
+                (Query.RemoveFields.byJsonPath tableName)
+                [ "@path", Sql.string jsonPath; fieldNameParam fieldNames ]
+                sqlProps
+    
+        /// Remove fields from documents via a JSON Path match query (@?)
+        let ByJsonPath(tableName, jsonPath, fieldNames, sqlProps) =
+            byJsonPath tableName jsonPath (List.ofSeq fieldNames) sqlProps
+    
     /// Commands to delete documents
     [<RequireQualifiedAccess>]
     module Delete =
@@ -497,7 +597,7 @@ module WithProps =
         /// Delete documents by matching a JSON field comparison query (->> =)
         [<CompiledName "ByField">]
         let byField tableName field sqlProps =
-            Custom.nonQuery (Query.Delete.byField tableName field) (addFieldParam field []) sqlProps
+            Custom.nonQuery (Query.Delete.byField tableName field) (addFieldParam "@field" field []) sqlProps
         
         /// Delete documents by matching a JSON contains query (@>)
         [<CompiledName "ByContains">]
@@ -753,6 +853,47 @@ module Patch =
         WithProps.Patch.byJsonPath tableName jsonPath patch (fromDataSource ())
 
 
+/// Commands to remove fields from documents
+[<RequireQualifiedAccess>]
+module RemoveFields =
+    
+    /// Remove fields from a document by the document's ID
+    [<CompiledName "FSharpById">]
+    let byId tableName (docId: 'TKey) fieldNames =
+        WithProps.RemoveFields.byId tableName docId fieldNames (fromDataSource ())
+    
+    /// Remove fields from a document by the document's ID
+    let ById(tableName, docId: 'TKey, fieldNames) =
+        WithProps.RemoveFields.ById(tableName, docId, fieldNames, fromDataSource ())
+    
+    /// Remove fields from documents via a comparison on a JSON field in the document
+    [<CompiledName "FSharpByField">]
+    let byField tableName field fieldNames =
+        WithProps.RemoveFields.byField tableName field fieldNames (fromDataSource ())
+    
+    /// Remove fields from documents via a comparison on a JSON field in the document
+    let ByField(tableName, field, fieldNames) =
+        WithProps.RemoveFields.ByField(tableName, field, fieldNames, fromDataSource ())
+    
+    /// Remove fields from documents via a JSON containment query (@>)
+    [<CompiledName "FSharpByContains">]
+    let byContains tableName (criteria: 'TContains) fieldNames =
+        WithProps.RemoveFields.byContains tableName criteria fieldNames (fromDataSource ())
+
+    /// Remove fields from documents via a JSON containment query (@>)
+    let ByContains(tableName, criteria: 'TContains, fieldNames) =
+        WithProps.RemoveFields.ByContains(tableName, criteria, fieldNames, fromDataSource ())
+
+    /// Remove fields from documents via a JSON Path match query (@?)
+    [<CompiledName "FSharpByJsonPath">]
+    let byJsonPath tableName jsonPath fieldNames =
+        WithProps.RemoveFields.byJsonPath tableName jsonPath fieldNames (fromDataSource ())
+
+    /// Remove fields from documents via a JSON Path match query (@?)
+    let ByJsonPath(tableName, jsonPath, fieldNames) =
+        WithProps.RemoveFields.ByJsonPath(tableName, jsonPath, fieldNames, fromDataSource ())
+
+    
 /// Commands to delete documents
 [<RequireQualifiedAccess>]
 module Delete =

src/Sqlite/Extensions.fs

@@ -88,13 +88,13 @@ module Extensions =
         member conn.patchByField tableName field (patch: 'TPatch) =
             WithConn.Patch.byField tableName field patch conn
 
-        /// Remove a field from a document by the document's ID
+        /// Remove fields from a document by the document's ID
-        member conn.removeFieldById tableName (docId: 'TKey) fieldName =
+        member conn.removeFieldsById tableName (docId: 'TKey) fieldNames =
-            WithConn.RemoveField.byId tableName docId fieldName conn
+            WithConn.RemoveFields.byId tableName docId fieldNames conn
         
         /// Remove a field from a document via a comparison on a JSON field in the document
-        member conn.removeFieldByField tableName field fieldName =
+        member conn.removeFieldsByField tableName field fieldNames =
-            WithConn.RemoveField.byField tableName field fieldName conn
+            WithConn.RemoveFields.byField tableName field fieldNames conn
         
         /// Delete a document by its ID
         member conn.deleteById tableName (docId: 'TKey) =
@@ -212,15 +212,15 @@ type SqliteConnectionCSharpExtensions =
     static member inline PatchByField<'TPatch>(conn, tableName, field, patch: 'TPatch) =
         WithConn.Patch.byField tableName field patch conn
 
-    /// Remove a field from a document by the document's ID
+    /// Remove fields from a document by the document's ID
     [<Extension>]
-    static member inline RemoveFieldById<'TKey>(conn, tableName, docId: 'TKey, fieldName) =
+    static member inline RemoveFieldsById<'TKey>(conn, tableName, docId: 'TKey, fieldNames) =
-        WithConn.RemoveField.byId tableName docId fieldName conn
+        WithConn.RemoveFields.ById(tableName, docId, fieldNames, conn)
         
-    /// Remove a field from a document via a comparison on a JSON field in the document
+    /// Remove fields from documents via a comparison on a JSON field in the document
     [<Extension>]
-    static member inline RemoveFieldByField(conn, tableName, field, fieldName) =
+    static member inline RemoveFieldsByField(conn, tableName, field, fieldNames) =
-        WithConn.RemoveField.byField tableName field fieldName conn
+        WithConn.RemoveFields.ByField(tableName, field, fieldNames, conn)
     
     /// Delete a document by its ID
     [<Extension>]

src/Sqlite/Library.fs

@@ -42,30 +42,45 @@ module Query =
     /// Document patching (partial update) queries
     module Patch =
         
+        /// Create an UPDATE statement to patch documents
+        let internal update tableName whereClause =
+            $"UPDATE %s{tableName} SET data = json_patch(data, json(@data)) WHERE %s{whereClause}"
+        
         /// Query to patch (partially update) a document by its ID
         [<CompiledName "ById">]
         let byId tableName =
-            $"""UPDATE %s{tableName} SET data = json_patch(data, json(@data)) WHERE {Query.whereById "@id"}"""
+            Query.whereById "@id" |> update tableName
             
         /// Query to patch (partially update) a document via a comparison on a JSON field
         [<CompiledName "ByField">]
         let byField tableName field =
-            sprintf
+            Query.whereByField field "@field" |> update tableName
-                "UPDATE %s SET data = json_patch(data, json(@data)) WHERE %s"
-                tableName (Query.whereByField field "@field")
     
-    /// Queries to remove a field from a document
+    /// Queries to remove fields from documents
-    module RemoveField =
+    module RemoveFields =
         
-        /// Query to remove a field from a document by the document's ID
+        /// Create an UPDATE statement to remove parameters
-        [<CompiledName "ById">]
+        let internal update tableName (parameters: SqliteParameter list) whereClause =
-        let byId tableName =
+            let paramNames = parameters |> List.map _.ParameterName |> String.concat ", "
-            $"""UPDATE %s{tableName} SET data = json_remove(data, @name) WHERE {Query.whereById "@id"}"""
+            $"UPDATE %s{tableName} SET data = json_remove(data, {paramNames}) WHERE {whereClause}"
             
-        /// Query to remove a field from a document via a comparison on a JSON field within the document
+        /// Query to remove fields from a document by the document's ID
-        [<CompiledName "ByField">]
+        [<CompiledName "FSharpById">]
-        let byField tableName field =
+        let byId tableName parameters =
-            $"""UPDATE %s{tableName} SET data = json_remove(data, @name) WHERE {Query.whereByField field "@field"}"""
+            Query.whereById "@id" |> update tableName parameters
+        
+        /// Query to remove fields from a document by the document's ID
+        let ById(tableName, parameters) =
+            byId tableName (List.ofSeq parameters)
+        
+        /// Query to remove fields from documents via a comparison on a JSON field within the document
+        [<CompiledName "FSharpByField">]
+        let byField tableName field parameters =
+            Query.whereByField field "@field" |> update tableName parameters
+        
+        /// Query to remove fields from documents via a comparison on a JSON field within the document
+        let ByField(tableName, field, parameters) =
+            byField tableName field (List.ofSeq parameters)
 
 
 /// Parameter handling helpers
@@ -84,21 +99,23 @@ module Parameters =
 
     /// Create a JSON field parameter (name "@field")
     [<CompiledName "FSharpAddField">]
-    let addFieldParam field parameters =
+    let addFieldParam name field parameters =
-        match field.Op with
+        match field.Op with EX | NEX -> parameters | _ -> SqliteParameter(name, field.Value) :: parameters
-        | EX | NEX -> parameters
-        | _ -> SqliteParameter("@field", field.Value) :: parameters
     
     /// Create a JSON field parameter (name "@field")
-    let AddField field parameters =
+    let AddField(name, field, parameters) =
         match field.Op with
         | EX | NEX -> parameters
-        | _ -> SqliteParameter("@field", field.Value) |> Seq.singleton |> Seq.append parameters
+        | _ -> SqliteParameter(name, field.Value) |> Seq.singleton |> Seq.append parameters
 
-    /// Create a JSON field name parameter (name "@name")
+    /// Append JSON field name parameters for the given field names to the given parameters
-    [<CompiledName "FieldName">]
+    [<CompiledName "FSharpFieldNames">]
-    let fieldNameParam name =
+    let fieldNameParams paramName (fieldNames: string list) =
-        SqliteParameter("@name", $"$.%s{name}")
+        fieldNames |> List.mapi (fun idx name -> SqliteParameter($"%s{paramName}{idx}", $"$.{name}"))
+
+    /// Append JSON field name parameters for the given field names to the given parameters
+    let FieldNames(paramName, fieldNames: string seq) =
+        fieldNames |> Seq.mapi (fun idx name -> SqliteParameter($"%s{paramName}{idx}", $"$.{name}"))
 
     /// An empty parameter sequence
     [<CompiledName "None">]
@@ -250,7 +267,7 @@ module WithConn =
         /// Count matching documents using a comparison on a JSON field
         [<CompiledName "ByField">]
         let byField tableName field conn =
-            Custom.scalar (Query.Count.byField tableName field) (addFieldParam field []) toCount conn
+            Custom.scalar (Query.Count.byField tableName field) (addFieldParam "@field" field []) toCount conn
 
     /// Commands to determine if documents exist
     [<RequireQualifiedAccess>]
@@ -264,7 +281,7 @@ module WithConn =
         /// Determine if a document exists using a comparison on a JSON field
         [<CompiledName "ByField">]
         let byField tableName field conn =
-            Custom.scalar (Query.Exists.byField tableName field) (addFieldParam field []) toExists conn
+            Custom.scalar (Query.Exists.byField tableName field) (addFieldParam "@field" field []) toExists conn
     
     /// Commands to retrieve documents
     [<RequireQualifiedAccess>]
@@ -291,21 +308,24 @@ module WithConn =
         /// Retrieve documents via a comparison on a JSON field
         [<CompiledName "FSharpByField">]
         let byField<'TDoc> tableName field conn =
-            Custom.list<'TDoc> (Query.Find.byField tableName field) (addFieldParam field []) fromData<'TDoc> conn 
+            Custom.list<'TDoc>
+                (Query.Find.byField tableName field) (addFieldParam "@field" field []) fromData<'TDoc> conn 
         
         /// Retrieve documents via a comparison on a JSON field
         let ByField<'TDoc>(tableName, field, conn) =
-            Custom.List<'TDoc>(Query.Find.byField tableName field, addFieldParam field [], fromData<'TDoc>, conn) 
+            Custom.List<'TDoc>(
+                Query.Find.byField tableName field, addFieldParam "@field" field [], fromData<'TDoc>, conn) 
         
         /// Retrieve documents via a comparison on a JSON field, returning only the first result
         [<CompiledName "FSharpFirstByField">]
         let firstByField<'TDoc> tableName field conn =
-            Custom.single $"{Query.Find.byField tableName field} LIMIT 1" (addFieldParam field []) fromData<'TDoc> conn
+            Custom.single
+                $"{Query.Find.byField tableName field} LIMIT 1" (addFieldParam "@field" field []) fromData<'TDoc> conn
         
         /// Retrieve documents via a comparison on a JSON field, returning only the first result
         let FirstByField<'TDoc when 'TDoc: null>(tableName, field, conn) =
             Custom.Single(
-                $"{Query.Find.byField tableName field} LIMIT 1", addFieldParam field [], fromData<'TDoc>, conn)
+                $"{Query.Find.byField tableName field} LIMIT 1", addFieldParam "@field" field [], fromData<'TDoc>, conn)
     
     /// Commands to update documents
     [<RequireQualifiedAccess>]
@@ -337,22 +357,33 @@ module WithConn =
         /// Patch documents using a comparison on a JSON field
         [<CompiledName "ByField">]
         let byField tableName field (patch: 'TPatch) (conn: SqliteConnection) =
-            Custom.nonQuery (Query.Patch.byField tableName field) (addFieldParam field [ jsonParam "@data" patch ]) conn
+            Custom.nonQuery
+                (Query.Patch.byField tableName field) (addFieldParam "@field" field [ jsonParam "@data" patch ]) conn
 
     /// Commands to remove fields from documents
     [<RequireQualifiedAccess>]
-    module RemoveField =
+    module RemoveFields =
         
-        /// Remove a field from a document by the document's ID
+        /// Remove fields from a document by the document's ID
-        [<CompiledName "ById">]
+        [<CompiledName "FSharpById">]
-        let byId tableName (docId: 'TKey) fieldName conn =
+        let byId tableName (docId: 'TKey) fieldNames conn =
-            Custom.nonQuery (Query.RemoveField.byId tableName) [ idParam docId; fieldNameParam fieldName ] conn
+            let nameParams = fieldNameParams "@name" fieldNames
+            Custom.nonQuery (Query.RemoveFields.byId tableName nameParams) (idParam docId :: nameParams) conn
         
-        /// Remove a field from a document via a comparison on a JSON field in the document
+        /// Remove fields from a document by the document's ID
-        [<CompiledName "ByField">]
+        let ById(tableName, docId: 'TKey, fieldNames, conn) =
-        let byField tableName field fieldName conn =
+            byId tableName docId (List.ofSeq fieldNames) conn
+        
+        /// Remove fields from documents via a comparison on a JSON field in the document
+        [<CompiledName "FSharpByField">]
+        let byField tableName field fieldNames conn =
+            let nameParams = fieldNameParams "@name" fieldNames
             Custom.nonQuery
-                (Query.RemoveField.byField tableName field) (addFieldParam field [ fieldNameParam fieldName ]) conn
+                (Query.RemoveFields.byField tableName field nameParams) (addFieldParam "@field" field nameParams) conn
+        
+        /// Remove fields from documents via a comparison on a JSON field in the document
+        let ByField(tableName, field, fieldNames, conn) =
+            byField tableName field (List.ofSeq fieldNames) conn
     
     /// Commands to delete documents
     [<RequireQualifiedAccess>]
@@ -366,7 +397,7 @@ module WithConn =
         /// Delete documents by matching a comparison on a JSON field
         [<CompiledName "ByField">]
         let byField tableName field conn =
-            Custom.nonQuery (Query.Delete.byField tableName field) (addFieldParam field []) conn
+            Custom.nonQuery (Query.Delete.byField tableName field) (addFieldParam "@field" field []) conn
 
 
 /// Commands to execute custom SQL queries
@@ -563,19 +594,29 @@ module Patch =
 
 /// Commands to remove fields from documents
 [<RequireQualifiedAccess>]
-module RemoveField =
+module RemoveFields =
     
-    /// Remove a field from a document by the document's ID
+    /// Remove fields from a document by the document's ID
-    [<CompiledName "ById">]
+    [<CompiledName "FSharpById">]
-    let byId tableName (docId: 'TKey) fieldName =
+    let byId tableName (docId: 'TKey) fieldNames =
         use conn = Configuration.dbConn ()
-        WithConn.RemoveField.byId tableName docId fieldName conn
+        WithConn.RemoveFields.byId tableName docId fieldNames conn
         
-    /// Remove a field from a document via a comparison on a JSON field in the document
+    /// Remove fields from a document by the document's ID
-    [<CompiledName "ByField">]
+    let ById(tableName, docId: 'TKey, fieldNames) =
-    let byField tableName field fieldName =
         use conn = Configuration.dbConn ()
-        WithConn.RemoveField.byField tableName field fieldName conn
+        WithConn.RemoveFields.ById(tableName, docId, fieldNames, conn)
+        
+    /// Remove field from documents via a comparison on a JSON field in the document
+    [<CompiledName "FSharpByField">]
+    let byField tableName field fieldNames =
+        use conn = Configuration.dbConn ()
+        WithConn.RemoveFields.byField tableName field fieldNames conn
+
+    /// Remove field from documents via a comparison on a JSON field in the document
+    let ByField(tableName, field, fieldNames) =
+        use conn = Configuration.dbConn ()
+        WithConn.RemoveFields.ByField(tableName, field, fieldNames, conn)
 
 /// Commands to delete documents
 [<RequireQualifiedAccess>]

src/Tests.CSharp/PostgresCSharpExtensionTests.cs

@@ -711,6 +711,183 @@ public class PostgresCSharpExtensionTests
                 await conn.PatchByJsonPath(PostgresDb.TableName, "$.NumValue ? (@ < 0)", new { Foo = "green" });
             })
         }),
+        TestList("RemoveFieldsById", new[]
+        {
+            TestCase("succeeds when multiple fields are removed", async () =>
+            {
+                await using var db = PostgresDb.BuildDb();
+                await using var conn = MkConn(db);
+                await LoadDocs();
+
+                await conn.RemoveFieldsById(PostgresDb.TableName, "two", [ "Sub", "Value" ]);
+                var updated = await Find.ById<string, JsonDocument>(PostgresDb.TableName, "two");
+                Expect.isNotNull(updated, "The updated document should have been retrieved");
+                Expect.equal(updated.Value, "", "The string value should have been removed");
+                Expect.isNull(updated.Sub, "The sub-document should have been removed");
+            }),
+            TestCase("succeeds when a single field is removed", async () =>
+            {
+                await using var db = PostgresDb.BuildDb();
+                await using var conn = MkConn(db);
+                await LoadDocs();
+
+                await conn.RemoveFieldsById(PostgresDb.TableName, "two", [ "Sub" ]);
+                var updated = await Find.ById<string, JsonDocument>(PostgresDb.TableName, "two");
+                Expect.isNotNull(updated, "The updated document should have been retrieved");
+                Expect.notEqual(updated.Value, "", "The string value should not have been removed");
+                Expect.isNull(updated.Sub, "The sub-document should have been removed");
+            }),
+            TestCase("succeeds when a field is not removed", async () =>
+            {
+                await using var db = PostgresDb.BuildDb();
+                await using var conn = MkConn(db);
+                await LoadDocs();
+                    
+                // This not raising an exception is the test
+                await conn.RemoveFieldsById(PostgresDb.TableName, "two", [ "AFieldThatIsNotThere" ]);
+            }),
+            TestCase("succeeds when no document is matched", async () =>
+            {
+                await using var db = PostgresDb.BuildDb();
+                await using var conn = MkConn(db);
+                
+                // This not raising an exception is the test
+                await conn.RemoveFieldsById(PostgresDb.TableName, "two", [ "Value" ]);
+            })
+        }),
+        TestList("RemoveFieldsByField", new[]
+        {
+            TestCase("succeeds when multiple fields are removed", async () =>
+            {
+                await using var db = PostgresDb.BuildDb();
+                await using var conn = MkConn(db);
+                await LoadDocs();
+
+                await conn.RemoveFieldsByField(PostgresDb.TableName, Field.EQ("NumValue", "17"), [ "Sub", "Value" ]);
+                var updated = await Find.ById<string, JsonDocument>(PostgresDb.TableName, "four");
+                Expect.isNotNull(updated, "The updated document should have been retrieved");
+                Expect.equal(updated.Value, "", "The string value should have been removed");
+                Expect.isNull(updated.Sub, "The sub-document should have been removed");
+            }),
+            TestCase("succeeds when a single field is removed", async () =>
+            {
+                await using var db = PostgresDb.BuildDb();
+                await using var conn = MkConn(db);
+                await LoadDocs();
+
+                await conn.RemoveFieldsByField(PostgresDb.TableName, Field.EQ("NumValue", "17"), [ "Sub" ]);
+                var updated = await Find.ById<string, JsonDocument>(PostgresDb.TableName, "four");
+                Expect.isNotNull(updated, "The updated document should have been retrieved");
+                Expect.notEqual(updated.Value, "", "The string value should not have been removed");
+                Expect.isNull(updated.Sub, "The sub-document should have been removed");
+            }),
+            TestCase("succeeds when a field is not removed", async () =>
+            {
+                await using var db = PostgresDb.BuildDb();
+                await using var conn = MkConn(db);
+                await LoadDocs();
+                    
+                // This not raising an exception is the test
+                await conn.RemoveFieldsByField(PostgresDb.TableName, Field.EQ("NumValue", "17"), [ "Nothing" ]);
+            }),
+            TestCase("succeeds when no document is matched", async () =>
+            {
+                await using var db = PostgresDb.BuildDb();
+                await using var conn = MkConn(db);
+                
+                // This not raising an exception is the test
+                await conn.RemoveFieldsByField(PostgresDb.TableName, Field.NE("Abracadabra", "apple"), [ "Value" ]);
+            })
+        }),
+        TestList("RemoveFieldsByContains", new[]
+        {
+            TestCase("succeeds when multiple fields are removed", async () =>
+            {
+                await using var db = PostgresDb.BuildDb();
+                await using var conn = MkConn(db);
+                await LoadDocs();
+
+                await conn.RemoveFieldsByContains(PostgresDb.TableName, new { NumValue = 17 }, [ "Sub", "Value" ]);
+                var updated = await Find.ById<string, JsonDocument>(PostgresDb.TableName, "four");
+                Expect.isNotNull(updated, "The updated document should have been retrieved");
+                Expect.equal(updated.Value, "", "The string value should have been removed");
+                Expect.isNull(updated.Sub, "The sub-document should have been removed");
+            }),
+            TestCase("succeeds when a single field is removed", async () =>
+            {
+                await using var db = PostgresDb.BuildDb();
+                await using var conn = MkConn(db);
+                await LoadDocs();
+
+                await conn.RemoveFieldsByContains(PostgresDb.TableName, new { NumValue = 17 }, [ "Sub" ]);
+                var updated = await Find.ById<string, JsonDocument>(PostgresDb.TableName, "four");
+                Expect.isNotNull(updated, "The updated document should have been retrieved");
+                Expect.notEqual(updated.Value, "", "The string value should not have been removed");
+                Expect.isNull(updated.Sub, "The sub-document should have been removed");
+            }),
+            TestCase("succeeds when a field is not removed", async () =>
+            {
+                await using var db = PostgresDb.BuildDb();
+                await using var conn = MkConn(db);
+                await LoadDocs();
+                    
+                // This not raising an exception is the test
+                await conn.RemoveFieldsByContains(PostgresDb.TableName, new { NumValue = 17 }, [ "Nothing" ]);
+            }),
+            TestCase("succeeds when no document is matched", async () =>
+            {
+                await using var db = PostgresDb.BuildDb();
+                await using var conn = MkConn(db);
+                
+                // This not raising an exception is the test
+                await conn.RemoveFieldsByContains(PostgresDb.TableName, new { Abracadabra = "apple" }, [ "Value" ]);
+            })
+        }),
+        TestList("RemoveFieldsByJsonPath", new[]
+        {
+            TestCase("succeeds when multiple fields are removed", async () =>
+            {
+                await using var db = PostgresDb.BuildDb();
+                await using var conn = MkConn(db);
+                await LoadDocs();
+
+                await conn.RemoveFieldsByJsonPath(PostgresDb.TableName, "$.NumValue ? (@ == 17)", [ "Sub", "Value" ]);
+                var updated = await Find.ById<string, JsonDocument>(PostgresDb.TableName, "four");
+                Expect.isNotNull(updated, "The updated document should have been retrieved");
+                Expect.equal(updated.Value, "", "The string value should have been removed");
+                Expect.isNull(updated.Sub, "The sub-document should have been removed");
+            }),
+            TestCase("succeeds when a single field is removed", async () =>
+            {
+                await using var db = PostgresDb.BuildDb();
+                await using var conn = MkConn(db);
+                await LoadDocs();
+
+                await conn.RemoveFieldsByJsonPath(PostgresDb.TableName, "$.NumValue ? (@ == 17)", [ "Sub" ]);
+                var updated = await Find.ById<string, JsonDocument>(PostgresDb.TableName, "four");
+                Expect.isNotNull(updated, "The updated document should have been retrieved");
+                Expect.notEqual(updated.Value, "", "The string value should not have been removed");
+                Expect.isNull(updated.Sub, "The sub-document should have been removed");
+            }),
+            TestCase("succeeds when a field is not removed", async () =>
+            {
+                await using var db = PostgresDb.BuildDb();
+                await using var conn = MkConn(db);
+                await LoadDocs();
+                    
+                // This not raising an exception is the test
+                await conn.RemoveFieldsByJsonPath(PostgresDb.TableName, "$.NumValue ? (@ == 17)", [ "Nothing" ]);
+            }),
+            TestCase("succeeds when no document is matched", async () =>
+            {
+                await using var db = PostgresDb.BuildDb();
+                await using var conn = MkConn(db);
+                
+                // This not raising an exception is the test
+                await conn.RemoveFieldsByJsonPath(PostgresDb.TableName, "$.Abracadabra ? (@ == \"apple\")",
+                    [ "Value" ]);
+            })
+        }),
         TestList("DeleteById", new[]
         {
             TestCase("succeeds when a document is deleted", async () =>

src/Tests.CSharp/PostgresCSharpTests.cs

@@ -11,7 +11,7 @@ using static Runner;
 /// <summary>
 /// C# tests for the PostgreSQL implementation of <tt>BitBadger.Documents</tt>
 /// </summary>
-public class PostgresCSharpTests
+public static class PostgresCSharpTests
 {
     /// <summary>
     /// Tests which do not hit the database
@@ -36,7 +36,8 @@ public class PostgresCSharpTests
             {
                 TestCase("succeeds when a parameter is added", () =>
                 {
-                    var it = Parameters.AddField(Field.EQ("it", "242"), Enumerable.Empty<Tuple<string, SqlValue>>())
+                    var it = Parameters
+                        .AddField("@field", Field.EQ("it", "242"), Enumerable.Empty<Tuple<string, SqlValue>>())
                         .ToList();
                     Expect.hasLength(it, 1, "There should have been a parameter added");
                     Expect.equal(it[0].Item1, "@field", "Field parameter not constructed correctly");
@@ -44,10 +45,37 @@ public class PostgresCSharpTests
                 }),
                 TestCase("succeeds when a parameter is not added", () =>
                 {
-                    var it = Parameters.AddField(Field.EX("It"), Enumerable.Empty<Tuple<string, SqlValue>>());
+                    var it = Parameters.AddField("@it", Field.EX("It"), Enumerable.Empty<Tuple<string, SqlValue>>());
                     Expect.isEmpty(it, "There should not have been any parameters added");
                 })
             }),
+            TestList("RemoveFields", new[]
+            {
+                TestCase("ById succeeds", () =>
+                {
+                    Expect.equal(Postgres.Query.RemoveFields.ById("tbl"),
+                        "UPDATE tbl SET data = data - @name WHERE data ->> 'Id' = @id",
+                        "Remove field by ID query not correct");
+                }),
+                TestCase("ByField succeeds", () =>
+                {
+                    Expect.equal(Postgres.Query.RemoveFields.ByField("tbl", Field.LT("Fly", 0)),
+                        "UPDATE tbl SET data = data - @name WHERE data ->> 'Fly' < @field",
+                        "Remove field by field query not correct");
+                }),
+                TestCase("ByContains succeeds", () =>
+                {
+                    Expect.equal(Postgres.Query.RemoveFields.ByContains("tbl"),
+                        "UPDATE tbl SET data = data - @name WHERE data @> @criteria",
+                        "Remove field by contains query not correct");
+                }),
+                TestCase("ByJsonPath succeeds", () =>
+                {
+                    Expect.equal(Postgres.Query.RemoveFields.ByJsonPath("tbl"),
+                        "UPDATE tbl SET data = data - @name WHERE data @? @path::jsonpath",
+                        "Remove field by JSON path query not correct");
+                })
+            }),
             TestCase("None succeeds", () =>
             {
                 Expect.isEmpty(Parameters.None, "The no-params sequence should be empty");
@@ -883,6 +911,170 @@ public class PostgresCSharpTests
                 })
             })
         }),
+        TestList("RemoveFields", new[]
+        {
+            TestList("ById", new[]
+            {
+                TestCase("succeeds when multiple fields are removed", async () =>
+                {
+                    await using var db = PostgresDb.BuildDb();
+                    await LoadDocs();
+
+                    await RemoveFields.ById(PostgresDb.TableName, "two", [ "Sub", "Value" ]);
+                    var updated = await Find.ById<string, JsonDocument>(PostgresDb.TableName, "two");
+                    Expect.isNotNull(updated, "The updated document should have been retrieved");
+                    Expect.equal(updated.Value, "", "The string value should have been removed");
+                    Expect.isNull(updated.Sub, "The sub-document should have been removed");
+                }),
+                TestCase("succeeds when a single field is removed", async () =>
+                {
+                    await using var db = PostgresDb.BuildDb();
+                    await LoadDocs();
+
+                    await RemoveFields.ById(PostgresDb.TableName, "two", [ "Sub" ]);
+                    var updated = await Find.ById<string, JsonDocument>(PostgresDb.TableName, "two");
+                    Expect.isNotNull(updated, "The updated document should have been retrieved");
+                    Expect.notEqual(updated.Value, "", "The string value should not have been removed");
+                    Expect.isNull(updated.Sub, "The sub-document should have been removed");
+                }),
+                TestCase("succeeds when a field is not removed", async () =>
+                {
+                    await using var db = PostgresDb.BuildDb();
+                    await LoadDocs();
+                        
+                    // This not raising an exception is the test
+                    await RemoveFields.ById(PostgresDb.TableName, "two", [ "AFieldThatIsNotThere" ]);
+                }),
+                TestCase("succeeds when no document is matched", async () =>
+                {
+                    await using var db = PostgresDb.BuildDb();
+                    
+                    // This not raising an exception is the test
+                    await RemoveFields.ById(PostgresDb.TableName, "two", [ "Value" ]);
+                })
+            }),
+            TestList("ByField", new[]
+            {
+                TestCase("succeeds when multiple fields are removed", async () =>
+                {
+                    await using var db = PostgresDb.BuildDb();
+                    await LoadDocs();
+
+                    await RemoveFields.ByField(PostgresDb.TableName, Field.EQ("NumValue", "17"), [ "Sub", "Value" ]);
+                    var updated = await Find.ById<string, JsonDocument>(PostgresDb.TableName, "four");
+                    Expect.isNotNull(updated, "The updated document should have been retrieved");
+                    Expect.equal(updated.Value, "", "The string value should have been removed");
+                    Expect.isNull(updated.Sub, "The sub-document should have been removed");
+                }),
+                TestCase("succeeds when a single field is removed", async () =>
+                {
+                    await using var db = PostgresDb.BuildDb();
+                    await LoadDocs();
+
+                    await RemoveFields.ByField(PostgresDb.TableName, Field.EQ("NumValue", "17"), [ "Sub" ]);
+                    var updated = await Find.ById<string, JsonDocument>(PostgresDb.TableName, "four");
+                    Expect.isNotNull(updated, "The updated document should have been retrieved");
+                    Expect.notEqual(updated.Value, "", "The string value should not have been removed");
+                    Expect.isNull(updated.Sub, "The sub-document should have been removed");
+                }),
+                TestCase("succeeds when a field is not removed", async () =>
+                {
+                    await using var db = PostgresDb.BuildDb();
+                    await LoadDocs();
+                        
+                    // This not raising an exception is the test
+                    await RemoveFields.ByField(PostgresDb.TableName, Field.EQ("NumValue", "17"), [ "Nothing" ]);
+                }),
+                TestCase("succeeds when no document is matched", async () =>
+                {
+                    await using var db = PostgresDb.BuildDb();
+                    
+                    // This not raising an exception is the test
+                    await RemoveFields.ByField(PostgresDb.TableName, Field.NE("Abracadabra", "apple"), [ "Value" ]);
+                })
+            }),
+            TestList("ByContains", new[]
+            {
+                TestCase("succeeds when multiple fields are removed", async () =>
+                {
+                    await using var db = PostgresDb.BuildDb();
+                    await LoadDocs();
+
+                    await RemoveFields.ByContains(PostgresDb.TableName, new { NumValue = 17 }, [ "Sub", "Value" ]);
+                    var updated = await Find.ById<string, JsonDocument>(PostgresDb.TableName, "four");
+                    Expect.isNotNull(updated, "The updated document should have been retrieved");
+                    Expect.equal(updated.Value, "", "The string value should have been removed");
+                    Expect.isNull(updated.Sub, "The sub-document should have been removed");
+                }),
+                TestCase("succeeds when a single field is removed", async () =>
+                {
+                    await using var db = PostgresDb.BuildDb();
+                    await LoadDocs();
+
+                    await RemoveFields.ByContains(PostgresDb.TableName, new { NumValue = 17 }, [ "Sub" ]);
+                    var updated = await Find.ById<string, JsonDocument>(PostgresDb.TableName, "four");
+                    Expect.isNotNull(updated, "The updated document should have been retrieved");
+                    Expect.notEqual(updated.Value, "", "The string value should not have been removed");
+                    Expect.isNull(updated.Sub, "The sub-document should have been removed");
+                }),
+                TestCase("succeeds when a field is not removed", async () =>
+                {
+                    await using var db = PostgresDb.BuildDb();
+                    await LoadDocs();
+                        
+                    // This not raising an exception is the test
+                    await RemoveFields.ByContains(PostgresDb.TableName, new { NumValue = 17 }, [ "Nothing" ]);
+                }),
+                TestCase("succeeds when no document is matched", async () =>
+                {
+                    await using var db = PostgresDb.BuildDb();
+                    
+                    // This not raising an exception is the test
+                    await RemoveFields.ByContains(PostgresDb.TableName, new { Abracadabra = "apple" }, [ "Value" ]);
+                })
+            }),
+            TestList("ByJsonPath", new[]
+            {
+                TestCase("succeeds when multiple fields are removed", async () =>
+                {
+                    await using var db = PostgresDb.BuildDb();
+                    await LoadDocs();
+
+                    await RemoveFields.ByJsonPath(PostgresDb.TableName, "$.NumValue ? (@ == 17)", [ "Sub", "Value" ]);
+                    var updated = await Find.ById<string, JsonDocument>(PostgresDb.TableName, "four");
+                    Expect.isNotNull(updated, "The updated document should have been retrieved");
+                    Expect.equal(updated.Value, "", "The string value should have been removed");
+                    Expect.isNull(updated.Sub, "The sub-document should have been removed");
+                }),
+                TestCase("succeeds when a single field is removed", async () =>
+                {
+                    await using var db = PostgresDb.BuildDb();
+                    await LoadDocs();
+
+                    await RemoveFields.ByJsonPath(PostgresDb.TableName, "$.NumValue ? (@ == 17)", [ "Sub" ]);
+                    var updated = await Find.ById<string, JsonDocument>(PostgresDb.TableName, "four");
+                    Expect.isNotNull(updated, "The updated document should have been retrieved");
+                    Expect.notEqual(updated.Value, "", "The string value should not have been removed");
+                    Expect.isNull(updated.Sub, "The sub-document should have been removed");
+                }),
+                TestCase("succeeds when a field is not removed", async () =>
+                {
+                    await using var db = PostgresDb.BuildDb();
+                    await LoadDocs();
+                        
+                    // This not raising an exception is the test
+                    await RemoveFields.ByJsonPath(PostgresDb.TableName, "$.NumValue ? (@ == 17)", [ "Nothing" ]);
+                }),
+                TestCase("succeeds when no document is matched", async () =>
+                {
+                    await using var db = PostgresDb.BuildDb();
+                    
+                    // This not raising an exception is the test
+                    await RemoveFields.ByJsonPath(PostgresDb.TableName, "$.Abracadabra ? (@ == \"apple\")",
+                        [ "Value" ]);
+                })
+            })
+        }),
         TestList("Delete", new[]
         {
             TestList("ById", new[]

src/Tests.CSharp/SqliteCSharpExtensionTests.cs

@@ -467,17 +467,18 @@ public static class SqliteCSharpExtensionTests
                 await conn.PatchByField(SqliteDb.TableName, Field.EQ("Value", "burgundy"), new { Foo = "green" });
             })
         }),
-        TestList("RemoveFieldById", new[]
+        TestList("RemoveFieldsById", new[]
         {
-            TestCase("succeeds when a field is removed", async () =>
+            TestCase("succeeds when fields are removed", async () =>
             {
                 await using var db = await SqliteDb.BuildDb();
                 await using var conn = Sqlite.Configuration.DbConn();
                 await LoadDocs();
 
-                await conn.RemoveFieldById(SqliteDb.TableName, "two", "Sub");
+                await conn.RemoveFieldsById(SqliteDb.TableName, "two", [ "Sub", "Value" ]);
                 var updated = await Find.ById<string, JsonDocument>(SqliteDb.TableName, "two");
                 Expect.isNotNull(updated, "The updated document should have been retrieved");
+                Expect.equal(updated.Value, "", "The string value should have been removed");
                 Expect.isNull(updated.Sub, "The sub-document should have been removed");
             }),
             TestCase("succeeds when a field is not removed", async () =>
@@ -487,7 +488,7 @@ public static class SqliteCSharpExtensionTests
                 await LoadDocs();
                     
                 // This not raising an exception is the test
-                await conn.RemoveFieldById(SqliteDb.TableName, "two", "AFieldThatIsNotThere");
+                await conn.RemoveFieldsById(SqliteDb.TableName, "two", [ "AFieldThatIsNotThere" ]);
             }),
             TestCase("succeeds when no document is matched", async () =>
             {
@@ -495,10 +496,10 @@ public static class SqliteCSharpExtensionTests
                 await using var conn = Sqlite.Configuration.DbConn();
                 
                 // This not raising an exception is the test
-                await conn.RemoveFieldById(SqliteDb.TableName, "two", "Value");
+                await conn.RemoveFieldsById(SqliteDb.TableName, "two", [ "Value" ]);
             })
         }),
-        TestList("RemoveFieldByField", new[]
+        TestList("RemoveFieldsByField", new[]
         {
             TestCase("succeeds when a field is removed", async () =>
             {
@@ -506,7 +507,7 @@ public static class SqliteCSharpExtensionTests
                 await using var conn = Sqlite.Configuration.DbConn();
                 await LoadDocs();
 
-                await conn.RemoveFieldByField(SqliteDb.TableName, Field.EQ("NumValue", 17), "Sub");
+                await conn.RemoveFieldsByField(SqliteDb.TableName, Field.EQ("NumValue", 17), [ "Sub" ]);
                 var updated = await Find.ById<string, JsonDocument>(SqliteDb.TableName, "four");
                 Expect.isNotNull(updated, "The updated document should have been retrieved");
                 Expect.isNull(updated.Sub, "The sub-document should have been removed");
@@ -518,7 +519,7 @@ public static class SqliteCSharpExtensionTests
                 await LoadDocs();
                     
                 // This not raising an exception is the test
-                await conn.RemoveFieldByField(SqliteDb.TableName, Field.EQ("NumValue", 17), "Nothing");
+                await conn.RemoveFieldsByField(SqliteDb.TableName, Field.EQ("NumValue", 17), [ "Nothing" ]);
             }),
             TestCase("succeeds when no document is matched", async () =>
             {
@@ -526,7 +527,7 @@ public static class SqliteCSharpExtensionTests
                 await using var conn = Sqlite.Configuration.DbConn();
                 
                 // This not raising an exception is the test
-                await conn.RemoveFieldByField(SqliteDb.TableName, Field.NE("Abracadabra", "apple"), "Value");
+                await conn.RemoveFieldsByField(SqliteDb.TableName, Field.NE("Abracadabra", "apple"), [ "Value" ]);
             })
         }),
         TestList("DeleteById", new[]

src/Tests.CSharp/SqliteCSharpTests.cs

@@ -41,18 +41,19 @@ public static class SqliteCSharpTests
                         "UPDATE partial by JSON comparison query not correct");
                 })
             }),
-            TestList("RemoveField", new[]
+            TestList("RemoveFields", new[]
             {
                 TestCase("ById succeeds", () =>
                 {
-                    Expect.equal(Sqlite.Query.RemoveField.ById("tbl"),
+                    Expect.equal(Sqlite.Query.RemoveFields.ById("tbl", [ new SqliteParameter("@name", "one") ]),
                         "UPDATE tbl SET data = json_remove(data, @name) WHERE data ->> 'Id' = @id",
                         "Remove field by ID query not correct");
                 }),
                 TestCase("ByField succeeds", () =>
                 {
-                    Expect.equal(Sqlite.Query.RemoveField.ByField("tbl", Field.LT("Fly", 0)),
+                    Expect.equal(Sqlite.Query.RemoveFields.ByField("tbl", Field.LT("Fly", 0),
-                        "UPDATE tbl SET data = json_remove(data, @name) WHERE data ->> 'Fly' < @field",
+                            [ new SqliteParameter("@name0", "one"), new SqliteParameter("@name1", "two") ]),
+                        "UPDATE tbl SET data = json_remove(data, @name0, @name1) WHERE data ->> 'Fly' < @field",
                         "Remove field by field query not correct");
                 })
             })
@@ -73,7 +74,8 @@ public static class SqliteCSharpTests
             }),
             TestCase("AddField succeeds when adding a parameter", () =>
             {
-                var paramList = Parameters.AddField(Field.EQ("it", 99), Enumerable.Empty<SqliteParameter>()).ToList();
+                var paramList = Parameters.AddField("@field", Field.EQ("it", 99), Enumerable.Empty<SqliteParameter>())
+                    .ToList();
                 Expect.hasLength(paramList, 1, "There should have been a parameter added");
                 var theParam = paramList[0];
                 Expect.equal(theParam.ParameterName, "@field", "The parameter name is incorrect");
@@ -81,7 +83,7 @@ public static class SqliteCSharpTests
             }),
             TestCase("AddField succeeds when not adding a parameter", () =>
             {
-                var paramSeq = Parameters.AddField(Field.EX("Coffee"), Enumerable.Empty<SqliteParameter>());
+                var paramSeq = Parameters.AddField("@it", Field.EX("Coffee"), Enumerable.Empty<SqliteParameter>());
                 Expect.isEmpty(paramSeq, "There should not have been any parameters added");
             }),
             TestCase("None succeeds", () =>
@@ -92,14 +94,14 @@ public static class SqliteCSharpTests
         // Results are exhaustively executed in the context of other tests
     });
 
-    private static readonly List<JsonDocument> TestDocuments = new()
+    private static readonly List<JsonDocument> TestDocuments =
-    {
+    [
         new() { Id = "one", Value = "FIRST!", NumValue = 0 },
         new() { Id = "two", Value = "another", NumValue = 10, Sub = new() { Foo = "green", Bar = "blue" } },
         new() { Id = "three", Value = "", NumValue = 4 },
         new() { Id = "four", Value = "purple", NumValue = 17, Sub = new() { Foo = "green", Bar = "red" } },
         new() { Id = "five", Value = "purple", NumValue = 18 }
-    };
+    ];
 
     /// <summary>
     /// Add the test documents to the database
@@ -563,18 +565,19 @@ public static class SqliteCSharpTests
                 })
             })
         }),
-        TestList("RemoveField", new[]
+        TestList("RemoveFields", new[]
         {
             TestList("ById", new[]
             {
-                TestCase("succeeds when a field is removed", async () =>
+                TestCase("succeeds when fields are removed", async () =>
                 {
                     await using var db = await SqliteDb.BuildDb();
                     await LoadDocs();
 
-                    await RemoveField.ById(SqliteDb.TableName, "two", "Sub");
+                    await RemoveFields.ById(SqliteDb.TableName, "two", [ "Sub", "Value" ]);
                     var updated = await Find.ById<string, JsonDocument>(SqliteDb.TableName, "two");
                     Expect.isNotNull(updated, "The updated document should have been retrieved");
+                    Expect.equal(updated.Value, "", "The string value should have been removed");
                     Expect.isNull(updated.Sub, "The sub-document should have been removed");
                 }),
                 TestCase("succeeds when a field is not removed", async () =>
@@ -583,14 +586,14 @@ public static class SqliteCSharpTests
                     await LoadDocs();
                         
                     // This not raising an exception is the test
-                    await RemoveField.ById(SqliteDb.TableName, "two", "AFieldThatIsNotThere");
+                    await RemoveFields.ById(SqliteDb.TableName, "two", [ "AFieldThatIsNotThere" ]);
                 }),
                 TestCase("succeeds when no document is matched", async () =>
                 {
                     await using var db = await SqliteDb.BuildDb();
                     
                     // This not raising an exception is the test
-                    await RemoveField.ById(SqliteDb.TableName, "two", "Value");
+                    await RemoveFields.ById(SqliteDb.TableName, "two", [ "Value" ]);
                 })
             }),
             TestList("ByField", new[]
@@ -600,7 +603,7 @@ public static class SqliteCSharpTests
                     await using var db = await SqliteDb.BuildDb();
                     await LoadDocs();
 
-                    await RemoveField.ByField(SqliteDb.TableName, Field.EQ("NumValue", 17), "Sub");
+                    await RemoveFields.ByField(SqliteDb.TableName, Field.EQ("NumValue", 17), [ "Sub" ]);
                     var updated = await Find.ById<string, JsonDocument>(SqliteDb.TableName, "four");
                     Expect.isNotNull(updated, "The updated document should have been retrieved");
                     Expect.isNull(updated.Sub, "The sub-document should have been removed");
@@ -611,14 +614,14 @@ public static class SqliteCSharpTests
                     await LoadDocs();
                         
                     // This not raising an exception is the test
-                    await RemoveField.ByField(SqliteDb.TableName, Field.EQ("NumValue", 17), "Nothing");
+                    await RemoveFields.ByField(SqliteDb.TableName, Field.EQ("NumValue", 17), [ "Nothing" ]);
                 }),
                 TestCase("succeeds when no document is matched", async () =>
                 {
                     await using var db = await SqliteDb.BuildDb();
                     
                     // This not raising an exception is the test
-                    await RemoveField.ByField(SqliteDb.TableName, Field.NE("Abracadabra", "apple"), "Value");
+                    await RemoveFields.ByField(SqliteDb.TableName, Field.NE("Abracadabra", "apple"), [ "Value" ]);
                 })
             })
         }),

src/Tests/PostgresExtensionTests.fs

@@ -616,6 +616,162 @@ let integrationTests =
                 do! conn.patchByJsonPath PostgresDb.TableName "$.NumValue ? (@ < 0)" {| Foo = "green" |}
             }
         ]
+        testList "removeFieldsById" [
+            testTask "succeeds when multiple fields are removed" {
+                use db   = PostgresDb.BuildDb()
+                use conn = mkConn db
+                do! loadDocs conn
+
+                do! conn.removeFieldsById PostgresDb.TableName "two" [ "Sub"; "Value" ]
+                let! noSubs = conn.countByField PostgresDb.TableName (Field.NEX "Sub")
+                Expect.equal noSubs 4 "There should now be 4 documents without Sub fields"
+                let! noValue = conn.countByField PostgresDb.TableName (Field.NEX "Value")
+                Expect.equal noValue 1 "There should be 1 document without Value fields"
+            }
+            testTask "succeeds when a single field is removed" {
+                use db   = PostgresDb.BuildDb()
+                use conn = mkConn db
+                do! loadDocs conn
+
+                do! conn.removeFieldsById PostgresDb.TableName "two" [ "Sub" ]
+                let! noSubs = conn.countByField PostgresDb.TableName (Field.NEX "Sub")
+                Expect.equal noSubs 4 "There should now be 4 documents without Sub fields"
+                let! noValue = conn.countByField PostgresDb.TableName (Field.NEX "Value")
+                Expect.equal noValue 0 "There should be no documents without Value fields"
+            }
+            testTask "succeeds when a field is not removed" {
+                use db   = PostgresDb.BuildDb()
+                use conn = mkConn db
+                do! loadDocs conn
+                    
+                // This not raising an exception is the test
+                do! conn.removeFieldsById PostgresDb.TableName "two" [ "AFieldThatIsNotThere" ]
+            }
+            testTask "succeeds when no document is matched" {
+                use db   = PostgresDb.BuildDb()
+                use conn = mkConn db
+                
+                // This not raising an exception is the test
+                do! conn.removeFieldsById PostgresDb.TableName "two" [ "Value" ]
+            }
+        ]
+        testList "removeFieldsByField" [
+            testTask "succeeds when multiple fields are removed" {
+                use db   = PostgresDb.BuildDb()
+                use conn = mkConn db
+                do! loadDocs conn
+
+                do! conn.removeFieldsByField PostgresDb.TableName (Field.EQ "NumValue" "17") [ "Sub"; "Value" ]
+                let! noSubs = conn.countByField PostgresDb.TableName (Field.NEX "Sub")
+                Expect.equal noSubs 4 "There should now be 4 documents without Sub fields"
+                let! noValue = conn.countByField PostgresDb.TableName (Field.NEX "Value")
+                Expect.equal noValue 1 "There should be 1 document without Value fields"
+            }
+            testTask "succeeds when a single field is removed" {
+                use db   = PostgresDb.BuildDb()
+                use conn = mkConn db
+                do! loadDocs conn
+
+                do! conn.removeFieldsByField PostgresDb.TableName (Field.EQ "NumValue" "17") [ "Sub" ]
+                let! noSubs = conn.countByField PostgresDb.TableName (Field.NEX "Sub")
+                Expect.equal noSubs 4 "There should now be 4 documents without Sub fields"
+                let! noValue = conn.countByField PostgresDb.TableName (Field.NEX "Value")
+                Expect.equal noValue 0 "There should be no documents without Value fields"
+            }
+            testTask "succeeds when a field is not removed" {
+                use db   = PostgresDb.BuildDb()
+                use conn = mkConn db
+                do! loadDocs conn
+                    
+                // This not raising an exception is the test
+                do! conn.removeFieldsByField PostgresDb.TableName (Field.EQ "NumValue" "17") [ "Nothing" ]
+            }
+            testTask "succeeds when no document is matched" {
+                use db   = PostgresDb.BuildDb()
+                use conn = mkConn db
+                
+                // This not raising an exception is the test
+                do! conn.removeFieldsByField PostgresDb.TableName (Field.NE "Abracadabra" "apple") [ "Value" ]
+            }
+        ]
+        testList "removeFieldsByContains" [
+            testTask "succeeds when multiple fields are removed" {
+                use db   = PostgresDb.BuildDb()
+                use conn = mkConn db
+                do! loadDocs conn
+
+                do! conn.removeFieldsByContains PostgresDb.TableName {| NumValue = 17 |} [ "Sub"; "Value" ]
+                let! noSubs = conn.countByField PostgresDb.TableName (Field.NEX "Sub")
+                Expect.equal noSubs 4 "There should now be 4 documents without Sub fields"
+                let! noValue = conn.countByField PostgresDb.TableName (Field.NEX "Value")
+                Expect.equal noValue 1 "There should be 1 document without Value fields"
+            }
+            testTask "succeeds when a single field is removed" {
+                use db   = PostgresDb.BuildDb()
+                use conn = mkConn db
+                do! loadDocs conn
+
+                do! conn.removeFieldsByContains PostgresDb.TableName {| NumValue = 17 |} [ "Sub" ]
+                let! noSubs = conn.countByField PostgresDb.TableName (Field.NEX "Sub")
+                Expect.equal noSubs 4 "There should now be 4 documents without Sub fields"
+                let! noValue = conn.countByField PostgresDb.TableName (Field.NEX "Value")
+                Expect.equal noValue 0 "There should be no documents without Value fields"
+            }
+            testTask "succeeds when a field is not removed" {
+                use db   = PostgresDb.BuildDb()
+                use conn = mkConn db
+                do! loadDocs conn
+                    
+                // This not raising an exception is the test
+                do! conn.removeFieldsByContains PostgresDb.TableName {| NumValue = 17 |} [ "Nothing" ]
+            }
+            testTask "succeeds when no document is matched" {
+                use db   = PostgresDb.BuildDb()
+                use conn = mkConn db
+                
+                // This not raising an exception is the test
+                do! conn.removeFieldsByContains PostgresDb.TableName {| Abracadabra = "apple" |} [ "Value" ]
+            }
+        ]
+        testList "removeFieldsByJsonPath" [
+            testTask "succeeds when multiple fields are removed" {
+                use db   = PostgresDb.BuildDb()
+                use conn = mkConn db
+                do! loadDocs conn
+
+                do! conn.removeFieldsByJsonPath PostgresDb.TableName "$.NumValue ? (@ == 17)" [ "Sub"; "Value" ]
+                let! noSubs = conn.countByField PostgresDb.TableName (Field.NEX "Sub")
+                Expect.equal noSubs 4 "There should now be 4 documents without Sub fields"
+                let! noValue = conn.countByField PostgresDb.TableName (Field.NEX "Value")
+                Expect.equal noValue 1 "There should be 1 document without Value fields"
+            }
+            testTask "succeeds when a single field is removed" {
+                use db   = PostgresDb.BuildDb()
+                use conn = mkConn db
+                do! loadDocs conn
+
+                do! conn.removeFieldsByJsonPath PostgresDb.TableName "$.NumValue ? (@ == 17)" [ "Sub" ]
+                let! noSubs = conn.countByField PostgresDb.TableName (Field.NEX "Sub")
+                Expect.equal noSubs 4 "There should now be 4 documents without Sub fields"
+                let! noValue = conn.countByField PostgresDb.TableName (Field.NEX "Value")
+                Expect.equal noValue 0 "There should be no documents without Value fields"
+            }
+            testTask "succeeds when a field is not removed" {
+                use db   = PostgresDb.BuildDb()
+                use conn = mkConn db
+                do! loadDocs conn
+                    
+                // This not raising an exception is the test
+                do! conn.removeFieldsByJsonPath PostgresDb.TableName "$.NumValue ? (@ == 17)" [ "Nothing" ]
+            }
+            testTask "succeeds when no document is matched" {
+                use db   = PostgresDb.BuildDb()
+                use conn = mkConn db
+                
+                // This not raising an exception is the test
+                do! conn.removeFieldsByJsonPath PostgresDb.TableName "$.Abracadabra ? (@ == \"apple\")" [ "Value" ]
+            }
+        ]
         testList "deleteById" [
             testTask "succeeds when a document is deleted" {
                 use db   = PostgresDb.BuildDb()

src/Tests/PostgresTests.fs

@@ -20,7 +20,7 @@ let unitTests =
             }
             testList "addFieldParam" [
                 test "succeeds when a parameter is added" {
-                    let paramList = addFieldParam (Field.EQ "it" "242") []
+                    let paramList = addFieldParam "@field" (Field.EQ "it" "242") []
                     Expect.hasLength paramList 1 "There should have been a parameter added"
                     let it = paramList[0]
                     Expect.equal (fst it) "@field" "Field parameter name not correct"
@@ -31,7 +31,7 @@ let unitTests =
                     | _ -> Expect.isTrue false "The parameter was not a Parameter type"
                 }
                 test "succeeds when a parameter is not added" {
-                    let paramList = addFieldParam (Field.EX "tacos") []
+                    let paramList = addFieldParam "@field" (Field.EX "tacos") []
                     Expect.isEmpty paramList "There should not have been any parameters added"
                 }
             ]
@@ -135,6 +135,32 @@ let unitTests =
                         "UPDATE partial by JSON Path statement not correct"
                 }
             ]
+            testList "RemoveFields" [
+                test "byId succeeds" {
+                    Expect.equal
+                        (Query.RemoveFields.byId "tbl")
+                        "UPDATE tbl SET data = data - @name WHERE data ->> 'Id' = @id"
+                        "Remove field by ID query not correct"
+                }
+                test "byField succeeds" {
+                    Expect.equal
+                        (Query.RemoveFields.byField "tbl" (Field.LT "Fly" 0))
+                        "UPDATE tbl SET data = data - @name WHERE data ->> 'Fly' < @field"
+                        "Remove field by field query not correct"
+                }
+                test "byContains succeeds" {
+                    Expect.equal
+                        (Query.RemoveFields.byContains "tbl")
+                        "UPDATE tbl SET data = data - @name WHERE data @> @criteria"
+                        "Remove field by contains query not correct"
+                }
+                test "byJsonPath succeeds" {
+                    Expect.equal
+                        (Query.RemoveFields.byJsonPath "tbl")
+                        "UPDATE tbl SET data = data - @name WHERE data @? @path::jsonpath"
+                        "Remove field by JSON path query not correct"
+                }
+            ]
             testList "Delete" [
                 test "byContains succeeds" {
                     Expect.equal (Query.Delete.byContains PostgresDb.TableName)
@@ -743,6 +769,148 @@ let integrationTests =
                 }
             ]
         ]
+        testList "RemoveFields" [
+            testList "byId" [
+                testTask "succeeds when multiple fields are removed" {
+                    use db = PostgresDb.BuildDb()
+                    do! loadDocs ()
+
+                    do! RemoveFields.byId PostgresDb.TableName "two" [ "Sub"; "Value" ]
+                    let! noSubs = Count.byField PostgresDb.TableName (Field.NEX "Sub")
+                    Expect.equal noSubs 4 "There should now be 4 documents without Sub fields"
+                    let! noValue = Count.byField PostgresDb.TableName (Field.NEX "Value")
+                    Expect.equal noValue 1 "There should be 1 document without Value fields"
+                }
+                testTask "succeeds when a single field is removed" {
+                    use db = PostgresDb.BuildDb()
+                    do! loadDocs ()
+
+                    do! RemoveFields.byId PostgresDb.TableName "two" [ "Sub" ]
+                    let! noSubs = Count.byField PostgresDb.TableName (Field.NEX "Sub")
+                    Expect.equal noSubs 4 "There should now be 4 documents without Sub fields"
+                    let! noValue = Count.byField PostgresDb.TableName (Field.NEX "Value")
+                    Expect.equal noValue 0 "There should be no documents without Value fields"
+                }
+                testTask "succeeds when a field is not removed" {
+                    use db = PostgresDb.BuildDb()
+                    do! loadDocs ()
+                        
+                    // This not raising an exception is the test
+                    do! RemoveFields.byId PostgresDb.TableName "two" [ "AFieldThatIsNotThere" ]
+                }
+                testTask "succeeds when no document is matched" {
+                    use db = PostgresDb.BuildDb()
+                    
+                    // This not raising an exception is the test
+                    do! RemoveFields.byId PostgresDb.TableName "two" [ "Value" ]
+                }
+            ]
+            testList "byField" [
+                testTask "succeeds when multiple fields are removed" {
+                    use db = PostgresDb.BuildDb()
+                    do! loadDocs ()
+
+                    do! RemoveFields.byField PostgresDb.TableName (Field.EQ "NumValue" "17") [ "Sub"; "Value" ]
+                    let! noSubs = Count.byField PostgresDb.TableName (Field.NEX "Sub")
+                    Expect.equal noSubs 4 "There should now be 4 documents without Sub fields"
+                    let! noValue = Count.byField PostgresDb.TableName (Field.NEX "Value")
+                    Expect.equal noValue 1 "There should be 1 document without Value fields"
+                }
+                testTask "succeeds when a single field is removed" {
+                    use db = PostgresDb.BuildDb()
+                    do! loadDocs ()
+
+                    do! RemoveFields.byField PostgresDb.TableName (Field.EQ "NumValue" "17") [ "Sub" ]
+                    let! noSubs = Count.byField PostgresDb.TableName (Field.NEX "Sub")
+                    Expect.equal noSubs 4 "There should now be 4 documents without Sub fields"
+                    let! noValue = Count.byField PostgresDb.TableName (Field.NEX "Value")
+                    Expect.equal noValue 0 "There should be no documents without Value fields"
+                }
+                testTask "succeeds when a field is not removed" {
+                    use db = PostgresDb.BuildDb()
+                    do! loadDocs ()
+                        
+                    // This not raising an exception is the test
+                    do! RemoveFields.byField PostgresDb.TableName (Field.EQ "NumValue" "17") [ "Nothing" ]
+                }
+                testTask "succeeds when no document is matched" {
+                    use db = PostgresDb.BuildDb()
+                    
+                    // This not raising an exception is the test
+                    do! RemoveFields.byField PostgresDb.TableName (Field.NE "Abracadabra" "apple") [ "Value" ]
+                }
+            ]
+            testList "byContains" [
+                testTask "succeeds when multiple fields are removed" {
+                    use db = PostgresDb.BuildDb()
+                    do! loadDocs ()
+
+                    do! RemoveFields.byContains PostgresDb.TableName {| NumValue = 17 |} [ "Sub"; "Value" ]
+                    let! noSubs = Count.byField PostgresDb.TableName (Field.NEX "Sub")
+                    Expect.equal noSubs 4 "There should now be 4 documents without Sub fields"
+                    let! noValue = Count.byField PostgresDb.TableName (Field.NEX "Value")
+                    Expect.equal noValue 1 "There should be 1 document without Value fields"
+                }
+                testTask "succeeds when a single field is removed" {
+                    use db = PostgresDb.BuildDb()
+                    do! loadDocs ()
+
+                    do! RemoveFields.byContains PostgresDb.TableName {| NumValue = 17 |} [ "Sub" ]
+                    let! noSubs = Count.byField PostgresDb.TableName (Field.NEX "Sub")
+                    Expect.equal noSubs 4 "There should now be 4 documents without Sub fields"
+                    let! noValue = Count.byField PostgresDb.TableName (Field.NEX "Value")
+                    Expect.equal noValue 0 "There should be no documents without Value fields"
+                }
+                testTask "succeeds when a field is not removed" {
+                    use db = PostgresDb.BuildDb()
+                    do! loadDocs ()
+                        
+                    // This not raising an exception is the test
+                    do! RemoveFields.byContains PostgresDb.TableName {| NumValue = 17 |} [ "Nothing" ]
+                }
+                testTask "succeeds when no document is matched" {
+                    use db = PostgresDb.BuildDb()
+                    
+                    // This not raising an exception is the test
+                    do! RemoveFields.byContains PostgresDb.TableName {| Abracadabra = "apple" |} [ "Value" ]
+                }
+            ]
+            testList "byJsonPath" [
+                testTask "succeeds when multiple fields are removed" {
+                    use db = PostgresDb.BuildDb()
+                    do! loadDocs ()
+
+                    do! RemoveFields.byJsonPath PostgresDb.TableName "$.NumValue ? (@ == 17)" [ "Sub"; "Value" ]
+                    let! noSubs = Count.byField PostgresDb.TableName (Field.NEX "Sub")
+                    Expect.equal noSubs 4 "There should now be 4 documents without Sub fields"
+                    let! noValue = Count.byField PostgresDb.TableName (Field.NEX "Value")
+                    Expect.equal noValue 1 "There should be 1 document without Value fields"
+                }
+                testTask "succeeds when a single field is removed" {
+                    use db = PostgresDb.BuildDb()
+                    do! loadDocs ()
+
+                    do! RemoveFields.byJsonPath PostgresDb.TableName "$.NumValue ? (@ == 17)" [ "Sub" ]
+                    let! noSubs = Count.byField PostgresDb.TableName (Field.NEX "Sub")
+                    Expect.equal noSubs 4 "There should now be 4 documents without Sub fields"
+                    let! noValue = Count.byField PostgresDb.TableName (Field.NEX "Value")
+                    Expect.equal noValue 0 "There should be no documents without Value fields"
+                }
+                testTask "succeeds when a field is not removed" {
+                    use db = PostgresDb.BuildDb()
+                    do! loadDocs ()
+                        
+                    // This not raising an exception is the test
+                    do! RemoveFields.byJsonPath PostgresDb.TableName "$.NumValue ? (@ == 17)" [ "Nothing" ]
+                }
+                testTask "succeeds when no document is matched" {
+                    use db = PostgresDb.BuildDb()
+                    
+                    // This not raising an exception is the test
+                    do! RemoveFields.byJsonPath PostgresDb.TableName "$.Abracadabra ? (@ == \"apple\")" [ "Value" ]
+                }
+            ]
+        ]
         testList "Delete" [
             testList "byId" [
                 testTask "succeeds when a document is deleted" {

src/Tests/SqliteExtensionTests.fs

@@ -345,13 +345,13 @@ let integrationTests =
                 do! conn.patchByField SqliteDb.TableName (Field.EQ "Value" "burgundy") {| Foo = "green" |}
             }
         ]
-        testList "removeFieldById" [
+        testList "removeFieldsById" [
-            testTask "succeeds when a field is removed" {
+            testTask "succeeds when fields are removed" {
                 use! db   = SqliteDb.BuildDb()
                 use  conn = Configuration.dbConn ()
                 do! loadDocs ()
                 
-                do! conn.removeFieldById SqliteDb.TableName "two" "Sub"
+                do! conn.removeFieldsById SqliteDb.TableName "two" [ "Sub"; "Value" ]
                 try
                     let! _ = conn.findById<string, JsonDocument> SqliteDb.TableName "two"
                     Expect.isTrue false "The updated document should have failed to parse"
@@ -365,14 +365,14 @@ let integrationTests =
                 do! loadDocs ()
                 
                 // This not raising an exception is the test
-                do! conn.removeFieldById SqliteDb.TableName "two" "AFieldThatIsNotThere"
+                do! conn.removeFieldsById SqliteDb.TableName "two" [ "AFieldThatIsNotThere" ]
             }
             testTask "succeeds when no document is matched" {
                 use! db   = SqliteDb.BuildDb()
                 use  conn = Configuration.dbConn ()
                 
                 // This not raising an exception is the test
-                do! conn.removeFieldById SqliteDb.TableName "two" "Value"
+                do! conn.removeFieldsById SqliteDb.TableName "two" [ "Value" ]
             }
         ]
         testList "removeFieldByField" [
@@ -381,7 +381,7 @@ let integrationTests =
                 use  conn = Configuration.dbConn ()
                 do! loadDocs ()
                 
-                do! conn.removeFieldByField SqliteDb.TableName (Field.EQ "NumValue" 17) "Sub"
+                do! conn.removeFieldsByField SqliteDb.TableName (Field.EQ "NumValue" 17) [ "Sub" ]
                 try
                     let! _ = conn.findById<string, JsonDocument> SqliteDb.TableName "four"
                     Expect.isTrue false "The updated document should have failed to parse"
@@ -395,14 +395,14 @@ let integrationTests =
                 do! loadDocs ()
                 
                 // This not raising an exception is the test
-                do! conn.removeFieldByField SqliteDb.TableName (Field.EQ "NumValue" 17) "Nothing"
+                do! conn.removeFieldsByField SqliteDb.TableName (Field.EQ "NumValue" 17) [ "Nothing" ]
             }
             testTask "succeeds when no document is matched" {
                 use! db   = SqliteDb.BuildDb()
                 use  conn = Configuration.dbConn ()
                 
                 // This not raising an exception is the test
-                do! conn.removeFieldByField SqliteDb.TableName (Field.NE "Abracadabra" "apple") "Value"
+                do! conn.removeFieldsByField SqliteDb.TableName (Field.NE "Abracadabra" "apple") [ "Value" ]
             }
         ]
         testList "deleteById" [

src/Tests/SqliteTests.fs

@@ -32,17 +32,20 @@ let unitTests =
                         "UPDATE partial by JSON comparison query not correct"
                 }
             ]
-            testList "RemoveField" [
+            testList "RemoveFields" [
                 test "byId succeeds" {
                     Expect.equal
-                        (Query.RemoveField.byId "tbl")
+                        (Query.RemoveFields.byId "tbl" [ SqliteParameter("@name", "one") ])
                         "UPDATE tbl SET data = json_remove(data, @name) WHERE data ->> 'Id' = @id"
                         "Remove field by ID query not correct"
                 }
                 test "byField succeeds" {
                     Expect.equal
-                        (Query.RemoveField.byField "tbl" (Field.GT "Fly" 0))
+                        (Query.RemoveFields.byField
-                        "UPDATE tbl SET data = json_remove(data, @name) WHERE data ->> 'Fly' > @field"
+                             "tbl"
+                             (Field.GT "Fly" 0)
+                             [ SqliteParameter("@name0", "one"); SqliteParameter("@name1", "two") ])
+                        "UPDATE tbl SET data = json_remove(data, @name0, @name1) WHERE data ->> 'Fly' > @field"
                         "Remove field by field query not correct"
                 }
             ]
@@ -60,14 +63,14 @@ let unitTests =
             }
             testList "addFieldParam" [
                 test "succeeds when adding a parameter" {
-                    let paramList = addFieldParam (Field.EQ "it" 99) []
+                    let paramList = addFieldParam "@field" (Field.EQ "it" 99) []
                     Expect.hasLength paramList 1 "There should have been a parameter added"
                     let theParam = paramList[0]
                     Expect.equal theParam.ParameterName "@field" "The parameter name is incorrect"
                     Expect.equal theParam.Value 99 "The parameter value is incorrect"
                 }
                 test "succeeds when not adding a parameter" {
-                    let paramList = addFieldParam (Field.NEX "Coffee") []
+                    let paramList = addFieldParam "@it" (Field.NEX "Coffee") []
                     Expect.isEmpty paramList "There should not have been any parameters added"
                 }
             ]
@@ -512,13 +515,13 @@ let integrationTests =
                 }
             ]
         ]
-        testList "RemoveField" [
+        testList "RemoveFields" [
             testList "byId" [
-                testTask "succeeds when a field is removed" {
+                testTask "succeeds when fields is removed" {
                     use! db = SqliteDb.BuildDb()
                     do! loadDocs ()
                     
-                    do! RemoveField.byId SqliteDb.TableName "two" "Sub"
+                    do! RemoveFields.byId SqliteDb.TableName "two" [ "Sub"; "Value" ]
                     try
                         let! _ = Find.byId<string, JsonDocument> SqliteDb.TableName "two"
                         Expect.isTrue false "The updated document should have failed to parse"
@@ -531,13 +534,13 @@ let integrationTests =
                     do! loadDocs ()
                     
                     // This not raising an exception is the test
-                    do! RemoveField.byId SqliteDb.TableName "two" "AFieldThatIsNotThere"
+                    do! RemoveFields.byId SqliteDb.TableName "two" [ "AFieldThatIsNotThere" ]
                 }
                 testTask "succeeds when no document is matched" {
                     use! db = SqliteDb.BuildDb()
                     
                     // This not raising an exception is the test
-                    do! RemoveField.byId SqliteDb.TableName "two" "Value"
+                    do! RemoveFields.byId SqliteDb.TableName "two" [ "Value" ]
                 }
             ]
             testList "byField" [
@@ -545,7 +548,7 @@ let integrationTests =
                     use! db = SqliteDb.BuildDb()
                     do! loadDocs ()
                     
-                    do! RemoveField.byField SqliteDb.TableName (Field.EQ "NumValue" 17) "Sub"
+                    do! RemoveFields.byField SqliteDb.TableName (Field.EQ "NumValue" 17) [ "Sub" ]
                     try
                         let! _ = Find.byId<string, JsonDocument> SqliteDb.TableName "four"
                         Expect.isTrue false "The updated document should have failed to parse"
@@ -558,13 +561,13 @@ let integrationTests =
                     do! loadDocs ()
                     
                     // This not raising an exception is the test
-                    do! RemoveField.byField SqliteDb.TableName (Field.EQ "NumValue" 17) "Nothing"
+                    do! RemoveFields.byField SqliteDb.TableName (Field.EQ "NumValue" 17) [ "Nothing" ]
                 }
                 testTask "succeeds when no document is matched" {
                     use! db = SqliteDb.BuildDb()
                     
                     // This not raising an exception is the test
-                    do! RemoveField.byField SqliteDb.TableName (Field.NE "Abracadabra" "apple") "Value"
+                    do! RemoveFields.byField SqliteDb.TableName (Field.NE "Abracadabra" "apple") [ "Value" ]
                 }
             ]
         ]