diff --git a/src/Postgres/Library.fs b/src/Postgres/Library.fs
index 4be1a0c..d7d66f2 100644
--- a/src/Postgres/Library.fs
+++ b/src/Postgres/Library.fs
@@ -121,15 +121,17 @@ module Query =
         |> Seq.map (fun it ->
             match it.Op with
             | EX | NEX -> $"{it.PgSqlPath} {it.Op}"
-            | BT ->
-                let p      = name.Derive it.ParameterName
-                let names  = $"{p}min AND {p}max"
-                let values = it.Value :?> obj list
-                match values[0] with
+            | _ ->
+                let p           = name.Derive it.ParameterName
+                let path, value =
+                    match it.Op with
+                    | BT -> $"{p}min AND {p}max", (it.Value :?> obj list)[0]
+                    | _  -> p, it.Value
+                printfn $"%A{value}"
+                match value with
                 | :? int8    | :? uint8  | :? int16  | :? uint16 | :? int | :? uint32 | :? int64 | :? uint64
-                | :? decimal | :? single | :? double -> $"({it.PgSqlPath})::numeric {it.Op} {names}"
-                | _ -> $"{it.PgSqlPath} {it.Op} {names}"
-            | _ -> $"{it.PgSqlPath} {it.Op} {name.Derive it.ParameterName}")
+                | :? decimal | :? single | :? double -> $"({it.PgSqlPath})::numeric {it.Op} {path}"
+                | _ -> $"{it.PgSqlPath} {it.Op} {path}")
         |> String.concat (match howMatched with Any -> " OR " | All -> " AND ")
 
     /// Create a WHERE clause fragment to implement a comparison on a field in a JSON document
diff --git a/src/Tests/PostgresTests.fs b/src/Tests/PostgresTests.fs
index 229da1e..bbb9bef 100644
--- a/src/Tests/PostgresTests.fs
+++ b/src/Tests/PostgresTests.fs
@@ -664,20 +664,39 @@ let integrationTests =
                 let! theCount = Count.all PostgresDb.TableName
                 Expect.equal theCount 5 "There should have been 5 matching documents"
             }
-            testTask "byField succeeds for numeric range" {
-                use db = PostgresDb.BuildDb()
-                do! loadDocs ()
-                
-                let! theCount = Count.byField PostgresDb.TableName (Field.BT "NumValue" 10 20)
-                Expect.equal theCount 3 "There should have been 3 matching documents"
-            }
-            testTask "byField succeeds for non-numeric range" {
-                use db = PostgresDb.BuildDb()
-                do! loadDocs ()
-                
-                let! theCount = Count.byField PostgresDb.TableName (Field.BT "Value" "aardvark" "apple")
-                Expect.equal theCount 1 "There should have been 1 matching document"
-            }
+            testList "byFields" [
+                testTask "succeeds when items are found" {
+                    use db = PostgresDb.BuildDb()
+                    do! loadDocs ()
+                    
+                    let! theCount =
+                        Count.byFields PostgresDb.TableName Any [ Field.BT "NumValue" 15 20; Field.EQ "NumValue" 0 ]
+                    Expect.equal theCount 3 "There should have been 3 matching documents"
+                }
+                testTask "succeeds when items are not found" {
+                    use db = PostgresDb.BuildDb()
+                    do! loadDocs ()
+                    
+                    let! theCount = Count.byFields PostgresDb.TableName All [ Field.EX "Sub"; Field.GT "NumValue" 100 ]
+                    Expect.equal theCount 0 "There should have been no matching documents"
+                }
+            ]
+            testList "byField" [
+                testTask "succeeds for numeric range" {
+                    use db = PostgresDb.BuildDb()
+                    do! loadDocs ()
+                    
+                    let! theCount = Count.byField PostgresDb.TableName (Field.BT "NumValue" 10 20)
+                    Expect.equal theCount 3 "There should have been 3 matching documents"
+                }
+                testTask "succeeds for non-numeric range" {
+                    use db = PostgresDb.BuildDb()
+                    do! loadDocs ()
+                    
+                    let! theCount = Count.byField PostgresDb.TableName (Field.BT "Value" "aardvark" "apple")
+                    Expect.equal theCount 1 "There should have been 1 matching document"
+                }
+            ]
             testTask "byContains succeeds" {
                 use db = PostgresDb.BuildDb()
                 do! loadDocs ()
@@ -710,6 +729,23 @@ let integrationTests =
                     Expect.isFalse exists "There should not have been an existing document"
                 }
             ]
+            testList "byFields" [
+                testTask "succeeds when documents exist" {
+                    use db = PostgresDb.BuildDb()
+                    do! loadDocs ()
+
+                    let! exists = Exists.byFields PostgresDb.TableName Any [ Field.EX "Sub"; Field.EX "Boo" ]
+                    Expect.isTrue exists "There should have been existing documents"
+                }
+                testTask "succeeds when documents do not exist" {
+                    use db = PostgresDb.BuildDb()
+                    do! loadDocs ()
+
+                    let! exists =
+                        Exists.byFields PostgresDb.TableName All [ Field.EQ "NumValue" "six"; Field.EX "Nope" ]
+                    Expect.isFalse exists "There should not have been existing documents"
+                }
+            ]
             testList "byField" [
                 testTask "succeeds when documents exist" {
                     use db = PostgresDb.BuildDb()
@@ -782,7 +818,7 @@ let integrationTests =
                     Expect.equal results [] "There should have been no documents returned"
                 }
             ]
-            testList "byId" [
+            ftestList "byId" [
                 testTask "succeeds when a document is found" {
                     use db = PostgresDb.BuildDb()
                     do! loadDocs ()
@@ -799,6 +835,26 @@ let integrationTests =
                     Expect.isNone doc "There should not have been a document returned"
                 }
             ]
+            testList "byFields" [
+                testTask "succeeds when documents are found" {
+                    use db = PostgresDb.BuildDb()
+                    do! loadDocs ()
+
+                    let! docs =
+                        Find.byFields<JsonDocument>
+                            PostgresDb.TableName All [ Field.EQ "Value" "purple"; Field.EX "Sub" ]
+                    Expect.equal (List.length docs) 1 "There should have been one document returned"
+                }
+                testTask "succeeds when documents are not found" {
+                    use db = PostgresDb.BuildDb()
+                    do! loadDocs ()
+
+                    let! docs =
+                        Find.byFields<JsonDocument>
+                            PostgresDb.TableName All [ Field.EQ "Value" "mauve"; Field.NE "NumValue" 40 ]
+                    Expect.isEmpty docs "There should have been no documents returned"
+                }
+            ]
             testList "byField" [
                 testTask "succeeds when documents are found" {
                     use db = PostgresDb.BuildDb()