diff --git a/composer.json b/composer.json
index 0cd85ed..3c33d3e 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
     "rss": "https://git.bitbadger.solutions/bit-badger/pdo-document.rss"
   },
   "require": {
-    "php": ">=8.3",
+    "php": ">=8.1",
     "netresearch/jsonmapper": "^4",
     "ext-pdo": "*"
   },
diff --git a/composer.lock b/composer.lock
index c9a364a..5cb3710 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "ca79f450e8e715ad61ba3581734c0fe7",
+    "content-hash": "f4563891566be8872ae85552261303bd",
     "packages": [
         {
             "name": "netresearch/jsonmapper",
@@ -1697,7 +1697,7 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": ">=8.3",
+        "php": ">=8.1",
         "ext-pdo": "*"
     },
     "platform-dev": [],
diff --git a/src/Count.php b/src/Count.php
index df91c72..62b2513 100644
--- a/src/Count.php
+++ b/src/Count.php
@@ -26,14 +26,14 @@ class Count
      *
      * @param string $tableName The name of the table in which documents should be counted
      * @param array|Field[] $fields The field comparison to match
-     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @param FieldMatch|null $match How to handle multiple conditions (optional; defaults to All)
      * @return int The count of documents matching the field comparison
      * @throws DocumentException If one is encountered
      */
-    public static function byFields(string $tableName, array $fields, string $conjunction = 'AND'): int
+    public static function byFields(string $tableName, array $fields, ?FieldMatch $match = null): int
     {
         $namedFields = Parameters::nameFields($fields);
-        return Custom::scalar(Query\Count::byFields($tableName, $namedFields, $conjunction),
+        return Custom::scalar(Query\Count::byFields($tableName, $namedFields, $match),
             Parameters::addFields($namedFields, []), new CountMapper());
     }
 }
diff --git a/src/Delete.php b/src/Delete.php
index 00a408f..ee4fcb8 100644
--- a/src/Delete.php
+++ b/src/Delete.php
@@ -24,13 +24,13 @@ class Delete
      *
      * @param string $tableName The table from which documents should be deleted
      * @param array|Field[] $fields The field comparison to match
-     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @param FieldMatch|null $match How to handle multiple conditions (optional; defaults to All)
      * @throws DocumentException If any is encountered
      */
-    public static function byFields(string $tableName, array $fields, string $conjunction = 'AND'): void
+    public static function byFields(string $tableName, array $fields, ?FieldMatch $match = null): void
     {
         $namedFields = Parameters::nameFields($fields);
-        Custom::nonQuery(Query\Delete::byFields($tableName, $namedFields, $conjunction),
+        Custom::nonQuery(Query\Delete::byFields($tableName, $namedFields, $match),
             Parameters::addFields($namedFields, []));
     }
 }
diff --git a/src/Exists.php b/src/Exists.php
index 11548d4..bc9e1a5 100644
--- a/src/Exists.php
+++ b/src/Exists.php
@@ -27,14 +27,14 @@ class Exists
      *
      * @param string $tableName The name of the table in which document existence should be determined
      * @param Field[] $fields The field comparison to match
-     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @param FieldMatch|null $match How to handle multiple conditions (optional; defaults to All)
      * @return bool True if any documents match the field comparison, false if not
      * @throws DocumentException If any is encountered
      */
-    public static function byFields(string $tableName, array $fields, string $conjunction = 'AND'): bool
+    public static function byFields(string $tableName, array $fields, ?FieldMatch $match = null): bool
     {
         $namedFields = Parameters::nameFields($fields);
-        return Custom::scalar(Query\Exists::byFields($tableName, $namedFields, $conjunction),
+        return Custom::scalar(Query\Exists::byFields($tableName, $namedFields, $match),
             Parameters::addFields($namedFields, []), new ExistsMapper());
     }
 }
diff --git a/src/FieldMatch.php b/src/FieldMatch.php
new file mode 100644
index 0000000..6cb7b6d
--- /dev/null
+++ b/src/FieldMatch.php
@@ -0,0 +1,28 @@
+<?php declare(strict_types=1);
+
+namespace BitBadger\PDODocument;
+
+/**
+ * How multiple fields should be matched
+ */
+enum FieldMatch
+{
+    /** Match all provided fields (`AND`) */
+    case All;
+
+    /** Match any provided fields (`OR`) */
+    case Any;
+
+    /**
+     * Get the SQL keyword for this enumeration value
+     *
+     * @return string The SQL keyword for this enumeration value
+     */
+    public function toString(): string
+    {
+        return match ($this) {
+            FieldMatch::All => 'AND',
+            FieldMatch::Any => 'OR'
+        };
+    }
+}
diff --git a/src/Find.php b/src/Find.php
index a3bb007..aae5b35 100644
--- a/src/Find.php
+++ b/src/Find.php
@@ -45,15 +45,15 @@ class Find
      * @param string $tableName The table from which documents should be retrieved
      * @param array|Field[] $fields The field comparison to match
      * @param class-string<TDoc> $className The name of the class to be retrieved
-     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @param FieldMatch|null $match How to handle multiple conditions (optional; defaults to All)
      * @return DocumentList<TDoc> A list of documents matching the given field comparison
      * @throws DocumentException If any is encountered
      */
     public static function byFields(string $tableName, array $fields, string $className,
-                                    string $conjunction = 'AND'): DocumentList
+                                    ?FieldMatch $match = null): DocumentList
     {
         $namedFields = Parameters::nameFields($fields);
-        return Custom::list(Query\Find::byFields($tableName, $namedFields, $conjunction),
+        return Custom::list(Query\Find::byFields($tableName, $namedFields, $match),
             Parameters::addFields($namedFields, []), new DocumentMapper($className));
     }
 
@@ -64,15 +64,15 @@ class Find
      * @param string $tableName The table from which the document should be retrieved
      * @param array|Field[] $fields The field comparison to match
      * @param class-string<TDoc> $className The name of the class to be retrieved
-     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @param FieldMatch|null $match How to handle multiple conditions (optional; defaults to All)
      * @return false|TDoc The first document if any matches are found, false otherwise
      * @throws DocumentException If any is encountered
      */
     public static function firstByFields(string $tableName, array $fields, string $className,
-                                         string $conjunction = 'AND'): mixed
+                                         ?FieldMatch $match = null): mixed
     {
         $namedFields = Parameters::nameFields($fields);
-        return Custom::single(Query\Find::byFields($tableName, $namedFields, $conjunction),
+        return Custom::single(Query\Find::byFields($tableName, $namedFields, $match),
             Parameters::addFields($namedFields, []), new DocumentMapper($className));
     }
 }
diff --git a/src/Patch.php b/src/Patch.php
index 98e5378..75c7983 100644
--- a/src/Patch.php
+++ b/src/Patch.php
@@ -27,14 +27,14 @@ class Patch
      * @param string $tableName The table in which documents should be patched
      * @param array|Field[] $fields The field comparison to match
      * @param array|object $patch The object with which the documents should be patched (will be JSON-encoded)
-     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @param FieldMatch|null $match How to handle multiple conditions (optional; defaults to All)
      * @throws DocumentException If any is encountered
      */
     public static function byFields(string $tableName, array $fields, array|object $patch,
-                                    string $conjunction = 'AND'): void
+                                    ?FieldMatch $match = null): void
     {
         $namedFields = Parameters::nameFields($fields);
-        Custom::nonQuery(Query\Patch::byFields($tableName, $namedFields, $conjunction),
+        Custom::nonQuery(Query\Patch::byFields($tableName, $namedFields, $match),
             Parameters::addFields($namedFields, Parameters::json(':data', $patch)));
     }
 }
diff --git a/src/Query.php b/src/Query.php
index 495315a..c6cc83f 100644
--- a/src/Query.php
+++ b/src/Query.php
@@ -22,12 +22,14 @@ class Query
      * Create a WHERE clause fragment to implement a comparison on fields in a JSON document
      *
      * @param Field[] $fields The field comparison to generate
-     * @param string $conjunction How to join multiple conditions (optional; defaults to AND)
+     * @param FieldMatch|null $match How to join multiple conditions (optional; defaults to All)
      * @return string The WHERE clause fragment matching the given fields and parameter
+     * @throws DocumentException If the database mode has not been set
      */
-    public static function whereByFields(array $fields, string $conjunction = 'AND'): string
+    public static function whereByFields(array $fields, ?FieldMatch $match = null): string
     {
-        return implode(" $conjunction ", array_map(fn($it) => $it->toWhere(), $fields));
+        return implode(' ' . ($match ?? FieldMatch::All)->toString() . ' ',
+            array_map(fn($it) => $it->toWhere(), $fields));
     }
 
     /**
@@ -35,6 +37,7 @@ class Query
      *
      * @param string $paramName The parameter name where the value of the ID will be provided (optional; default @id)
      * @return string The WHERE clause fragment to match by ID
+     * @throws DocumentException If the database mode has not been set
      */
     public static function whereById(string $paramName = ':id'): string
     {
@@ -69,6 +72,7 @@ class Query
      *
      * @param string $tableName The name of the table in which the document should be updated
      * @return string The UPDATE query for the document
+     * @throws DocumentException If the database mode has not been set
      */
     public static function update(string $tableName): string
     {
diff --git a/src/Query/Count.php b/src/Query/Count.php
index 87c47e3..8727e96 100644
--- a/src/Query/Count.php
+++ b/src/Query/Count.php
@@ -2,7 +2,7 @@
 
 namespace BitBadger\PDODocument\Query;
 
-use BitBadger\PDODocument\{Field, Query};
+use BitBadger\PDODocument\{DocumentException, Field, FieldMatch, Query};
 
 /**
  * Queries for counting documents
@@ -25,11 +25,12 @@ class Count
      *
      * @param string $tableName The name of the table in which documents should be counted
      * @param Field[] $fields The field comparison to match
-     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @param FieldMatch|null $match How to join multiple conditions (optional; defaults to All)
      * @return string The query to count documents using a field comparison
+     * @throws DocumentException If the database mode has not been set
      */
-    public static function byFields(string $tableName, array $fields, string $conjunction = 'AND'): string
+    public static function byFields(string $tableName, array $fields, ?FieldMatch $match = null): string
     {
-        return self::all($tableName) . ' WHERE ' . Query::whereByFields($fields, $conjunction);
+        return self::all($tableName) . ' WHERE ' . Query::whereByFields($fields, $match);
     }
 }
diff --git a/src/Query/Delete.php b/src/Query/Delete.php
index 84bd2a0..a8303ab 100644
--- a/src/Query/Delete.php
+++ b/src/Query/Delete.php
@@ -2,7 +2,7 @@
 
 namespace BitBadger\PDODocument\Query;
 
-use BitBadger\PDODocument\{Field, Query};
+use BitBadger\PDODocument\{DocumentException, Field, FieldMatch, Query};
 
 /**
  * Queries to delete documents
@@ -14,6 +14,7 @@ class Delete
      *
      * @param string $tableName The name of the table from which a document should be deleted
      * @return string The DELETE statement to delete a document by its ID
+     * @throws DocumentException If the database mode has not been set
      */
     public static function byId(string $tableName): string
     {
@@ -25,11 +26,12 @@ class Delete
      *
      * @param string $tableName The name of the table from which documents should be deleted
      * @param Field[] $fields The field comparison to match
-     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @param FieldMatch|null $match How to handle multiple conditions (optional; defaults to All)
      * @return string The DELETE statement to delete documents via field comparison
+     * @throws DocumentException If the database mode has not been set
      */
-    public static function byFields(string $tableName, array $fields, string $conjunction = 'AND'): string
+    public static function byFields(string $tableName, array $fields, ?FieldMatch $match = null): string
     {
-        return "DELETE FROM $tableName WHERE " . Query::whereByFields($fields, $conjunction);
+        return "DELETE FROM $tableName WHERE " . Query::whereByFields($fields, $match);
     }
 }
diff --git a/src/Query/Exists.php b/src/Query/Exists.php
index a7750b1..6ff86f4 100644
--- a/src/Query/Exists.php
+++ b/src/Query/Exists.php
@@ -2,7 +2,7 @@
 
 namespace BitBadger\PDODocument\Query;
 
-use BitBadger\PDODocument\{Field, Query};
+use BitBadger\PDODocument\{DocumentException, Field, FieldMatch, Query};
 
 /**
  * Queries to determine document existence
@@ -26,6 +26,7 @@ class Exists
      *
      * @param string $tableName The name of the table in which document existence should be checked
      * @return string The query to determine document existence by ID
+     * @throws DocumentException If the database mode has not been set
      */
     public static function byId(string $tableName): string
     {
@@ -37,11 +38,12 @@ class Exists
      *
      * @param string $tableName The name of the table in which document existence should be checked
      * @param Field[] $fields The field comparison to match
-     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @param FieldMatch|null $match How to handle multiple conditions (optional; defaults to All)
      * @return string The query to determine document existence by field comparison
+     * @throws DocumentException If the database mode has not been set
      */
-    public static function byFields(string $tableName, array $fields, string $conjunction = 'AND'): string
+    public static function byFields(string $tableName, array $fields, ?FieldMatch $match = null): string
     {
-        return self::query($tableName, Query::whereByFields($fields, $conjunction));
+        return self::query($tableName, Query::whereByFields($fields, $match));
     }
 }
diff --git a/src/Query/Find.php b/src/Query/Find.php
index 2e65385..824e8f3 100644
--- a/src/Query/Find.php
+++ b/src/Query/Find.php
@@ -2,7 +2,7 @@
 
 namespace BitBadger\PDODocument\Query;
 
-use BitBadger\PDODocument\{Field, Query};
+use BitBadger\PDODocument\{DocumentException, Field, FieldMatch, Query};
 
 /**
  * Queries for retrieving documents
@@ -14,6 +14,7 @@ class Find
      *
      * @param string $tableName The name of the table from which a document should be retrieved
      * @return string The SELECT statement to retrieve a document by its ID
+     * @throws DocumentException If the database mode has not been set
      */
     public static function byId(string $tableName): string
     {
@@ -25,11 +26,12 @@ class Find
      *
      * @param string $tableName The name of the table from which documents should be retrieved
      * @param Field[] $fields The field comparison to match
-     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @param FieldMatch|null $match How to handle multiple conditions (optional; defaults to All)
      * @return string The SELECT statement to retrieve documents by field comparison
+     * @throws DocumentException If the database mode has not been set
      */
-    public static function byFields(string $tableName, array $fields, string $conjunction = 'AND'): string
+    public static function byFields(string $tableName, array $fields, ?FieldMatch $match = null): string
     {
-        return Query::selectFromTable($tableName) . ' WHERE ' . Query::whereByFields($fields, $conjunction);
+        return Query::selectFromTable($tableName) . ' WHERE ' . Query::whereByFields($fields, $match);
     }
 }
diff --git a/src/Query/Patch.php b/src/Query/Patch.php
index 6b1ab76..50a696b 100644
--- a/src/Query/Patch.php
+++ b/src/Query/Patch.php
@@ -2,7 +2,7 @@
 
 namespace BitBadger\PDODocument\Query;
 
-use BitBadger\PDODocument\{Configuration, DocumentException, Field, Mode, Query};
+use BitBadger\PDODocument\{Configuration, DocumentException, Field, FieldMatch, Mode, Query};
 
 /**
  * Queries to perform partial updates on documents
@@ -44,12 +44,12 @@ class Patch
      *
      * @param string $tableName The name of the table in which documents should be patched
      * @param array|Field[] $field The field comparison to match
-     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @param FieldMatch|null $match How to handle multiple conditions (optional; defaults to All)
      * @return string The query to patch documents via field comparison
      * @throws DocumentException If the database mode has not been set
      */
-    public static function byFields(string $tableName, array $field, string $conjunction = 'AND'): string
+    public static function byFields(string $tableName, array $field, ?FieldMatch $match = null): string
     {
-        return self::update($tableName, Query::whereByFields($field, $conjunction));
+        return self::update($tableName, Query::whereByFields($field, $match));
     }
 }
diff --git a/src/Query/RemoveFields.php b/src/Query/RemoveFields.php
index 0e3fea0..c668abf 100644
--- a/src/Query/RemoveFields.php
+++ b/src/Query/RemoveFields.php
@@ -2,7 +2,7 @@
 
 namespace BitBadger\PDODocument\Query;
 
-use BitBadger\PDODocument\{Configuration, DocumentException, Field, Mode, Query};
+use BitBadger\PDODocument\{Configuration, DocumentException, Field, FieldMatch, Mode, Query};
 
 /**
  * Queries to remove fields from documents
@@ -54,13 +54,13 @@ class RemoveFields
      * @param string $tableName The name of the table in which documents should be manipulated
      * @param array|Field[] $fields The field comparison to match
      * @param array $parameters The parameter list for the query
-     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @param FieldMatch|null $match How to handle multiple conditions (optional; defaults to All)
      * @return string The UPDATE statement to remove fields from documents via field comparison
      * @throws DocumentException If the database mode has not been set
      */
     public static function byFields(string $tableName, array $fields, array $parameters,
-                                    string $conjunction = 'AND'): string
+                                    ?FieldMatch $match = null): string
     {
-        return self::update($tableName, $parameters, Query::whereByFields($fields, $conjunction));
+        return self::update($tableName, $parameters, Query::whereByFields($fields, $match));
     }
 }
diff --git a/src/RemoveFields.php b/src/RemoveFields.php
index b32e2f4..3933e7d 100644
--- a/src/RemoveFields.php
+++ b/src/RemoveFields.php
@@ -28,15 +28,15 @@ class RemoveFields
      * @param string $tableName The table in which documents should have fields removed
      * @param array|Field[] $fields The field comparison to match
      * @param array|string[] $fieldNames The names of the fields to be removed
-     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @param FieldMatch|null $match How to handle multiple conditions (optional; defaults to All)
      * @throws DocumentException If any is encountered
      */
     public static function byFields(string $tableName, array $fields, array $fieldNames,
-                                    string $conjunction = 'AND'): void
+                                    ?FieldMatch $match = null): void
     {
         $nameParams  = Parameters::fieldNames(':name', $fieldNames);
         $namedFields = Parameters::nameFields($fields);
-        Custom::nonQuery(Query\RemoveFields::byFields($tableName, $namedFields, $nameParams, $conjunction),
+        Custom::nonQuery(Query\RemoveFields::byFields($tableName, $namedFields, $nameParams, $match),
             Parameters::addFields($namedFields, $nameParams));
     }
 }
diff --git a/tests/unit/FieldMatchTest.php b/tests/unit/FieldMatchTest.php
new file mode 100644
index 0000000..9fd8942
--- /dev/null
+++ b/tests/unit/FieldMatchTest.php
@@ -0,0 +1,22 @@
+<?php declare(strict_types=1);
+
+namespace Test\Unit;
+
+use BitBadger\PDODocument\FieldMatch;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Unit tests for the FieldMatch enum
+ */
+class FieldMatchTest extends TestCase
+{
+    public function testToStringSucceedsForAll(): void
+    {
+        $this->assertEquals('AND', FieldMatch::All->toString(), 'All should have returned AND');
+    }
+
+    public function testToStringSucceedsForAny(): void
+    {
+        $this->assertEquals('OR', FieldMatch::Any->toString(), 'Any should have returned OR');
+    }
+}
diff --git a/tests/unit/Query/FindTest.php b/tests/unit/Query/FindTest.php
index 5b2fb9a..10e7d73 100644
--- a/tests/unit/Query/FindTest.php
+++ b/tests/unit/Query/FindTest.php
@@ -2,7 +2,7 @@
 
 namespace Test\Unit\Query;
 
-use BitBadger\PDODocument\{Configuration, Field, Mode};
+use BitBadger\PDODocument\{Configuration, Field, FieldMatch, Mode};
 use BitBadger\PDODocument\Query\Find;
 use PHPUnit\Framework\Attributes\TestDox;
 use PHPUnit\Framework\TestCase;
@@ -32,7 +32,8 @@ class FindTest extends TestCase
     public function testByFieldsSucceeds(): void
     {
         $this->assertEquals("SELECT data FROM there WHERE data->>'active' = :act OR data->>'locked' = :lock",
-            Find::byFields('there', [Field::EQ('active', true, ':act'), Field::EQ('locked', true, ':lock')], 'OR'),
+            Find::byFields('there', [Field::EQ('active', true, ':act'), Field::EQ('locked', true, ':lock')],
+                FieldMatch::Any),
             'SELECT query not generated correctly');
     }
 }
diff --git a/tests/unit/QueryTest.php b/tests/unit/QueryTest.php
index b3ac80b..d92d4b7 100644
--- a/tests/unit/QueryTest.php
+++ b/tests/unit/QueryTest.php
@@ -2,7 +2,7 @@
 
 namespace Test\Unit;
 
-use BitBadger\PDODocument\{Configuration, Field, Mode, Query};
+use BitBadger\PDODocument\{Configuration, Field, FieldMatch, Mode, Query};
 use PHPUnit\Framework\Attributes\TestDox;
 use PHPUnit\Framework\TestCase;
 
@@ -33,17 +33,18 @@ class QueryTest extends TestCase
             Query::whereByFields([Field::LE('test_field', '', ':it')]), 'WHERE fragment not constructed correctly');
     }
 
-    public function testWhereByFieldsSucceedsForMultipleFields(): void
+    public function testWhereByFieldsSucceedsForMultipleFieldsAll(): void
     {
         $this->assertEquals("data->>'test_field' <= :it AND data->>'other_field' = :other",
             Query::whereByFields([Field::LE('test_field', '', ':it'), Field::EQ('other_field', '', ':other')]),
             'WHERE fragment not constructed correctly');
     }
 
-    public function testWhereByFieldsSucceedsForMultipleFieldsWithOr(): void
+    public function testWhereByFieldsSucceedsForMultipleFieldsAny(): void
     {
         $this->assertEquals("data->>'test_field' <= :it OR data->>'other_field' = :other",
-            Query::whereByFields([Field::LE('test_field', '', ':it'), Field::EQ('other_field', '', ':other')], 'OR'),
+            Query::whereByFields([Field::LE('test_field', '', ':it'), Field::EQ('other_field', '', ':other')],
+                FieldMatch::Any),
             'WHERE fragment not constructed correctly');
     }