diff --git a/analyzer-baseline.toml b/analyzer-baseline.toml
index f94309d3..0ab2d502 100644
--- a/analyzer-baseline.toml
+++ b/analyzer-baseline.toml
@@ -1788,12 +1788,6 @@ code = "overly-wide-return-type"
 message = "Declared return type `null|string` for `processexpressionparametername` has unused branches: `null`."
 count = 1
 
-[[issues]]
-file = "src/Sql/AbstractSql.php"
-code = "possibly-false-argument"
-message = 'Argument #1 of method `PhpDb\Adapter\Platform\PlatformInterface::quoteIdentifier` is possibly `false`, but parameter type `string` does not accept it.'
-count = 1
-
 [[issues]]
 file = "src/Sql/AbstractSql.php"
 code = "possibly-invalid-argument"
@@ -1860,6 +1854,12 @@ code = "possibly-null-argument"
 message = 'Argument #4 of method `PhpDb\Sql\AbstractSql::processExpressionParameterName` is possibly `null`, but parameter type `PhpDb\Adapter\Driver\DriverInterface` does not accept it.'
 count = 1
 
+[[issues]]
+file = "src/Sql/AbstractSql.php"
+code = "possibly-undefined-string-array-index"
+message = 'Possibly undefined array key `string` accessed on `non-empty-array<string, PhpDb\Sql\Expression|PhpDb\Sql\Select|PhpDb\Sql\TableIdentifier|string>`.'
+count = 1
+
 [[issues]]
 file = "src/Sql/AbstractSql.php"
 code = "redundant-cast"
@@ -2292,18 +2292,6 @@ code = "missing-api-or-internal"
 message = 'Abstract class `PhpDb\Sql\Ddl\Constraint\AbstractConstraint` is missing an `@api` or `@internal` annotation.'
 count = 1
 
-[[issues]]
-file = "src/Sql/Ddl/Constraint/AbstractConstraint.php"
-code = "possibly-null-argument"
-message = 'Argument #1 of method `PhpDb\Sql\Argument\Identifier::__construct` is possibly `null`, but parameter type `string` does not accept it.'
-count = 1
-
-[[issues]]
-file = "src/Sql/Ddl/Constraint/AbstractConstraint.php"
-code = "possibly-undefined-int-array-index"
-message = "Possibly undefined array index accessed on `list<string>`."
-count = 1
-
 [[issues]]
 file = "src/Sql/Ddl/Constraint/Check.php"
 code = "class-must-be-final"
@@ -2478,18 +2466,6 @@ code = "class-must-be-final"
 message = 'Class `PhpDb\Sql\Ddl\Index\Index` should be declared `final`.'
 count = 1
 
-[[issues]]
-file = "src/Sql/Ddl/Index/Index.php"
-code = "possibly-null-argument"
-message = 'Argument #1 of method `PhpDb\Sql\Argument\Identifier::__construct` is possibly `null`, but parameter type `string` does not accept it.'
-count = 1
-
-[[issues]]
-file = "src/Sql/Ddl/Index/Index.php"
-code = "possibly-undefined-int-array-index"
-message = "Possibly undefined array index accessed on `list<string>`."
-count = 1
-
 [[issues]]
 file = "src/Sql/Delete.php"
 code = "class-must-be-final"
@@ -3582,12 +3558,6 @@ code = "possible-method-access-on-null"
 message = "Attempting to call a method on `null`."
 count = 2
 
-[[issues]]
-file = "src/Sql/Select.php"
-code = "possibly-false-argument"
-message = 'Argument #1 of method `PhpDb\Sql\AbstractSql::resolveTable` is possibly `false`, but parameter type `PhpDb\Sql\Select|PhpDb\Sql\TableIdentifier|null|string` does not accept it.'
-count = 1
-
 [[issues]]
 file = "src/Sql/Select.php"
 code = "possibly-false-iterator"
@@ -3636,6 +3606,12 @@ code = "possibly-null-argument"
 message = 'Argument #1 of method `PhpDb\Sql\AbstractSql::renderTable` is possibly `null`, but parameter type `string` does not accept it.'
 count = 1
 
+[[issues]]
+file = "src/Sql/Select.php"
+code = "possibly-null-array-index"
+message = "Possibly using `null` as an array index to access elementof variable $table."
+count = 1
+
 [[issues]]
 file = "src/Sql/Select.php"
 code = "possibly-null-operand"
@@ -3672,6 +3648,12 @@ code = "possibly-undefined-string-array-index"
 message = '''Possibly undefined array key 'type' accessed on `array{'modifier'?: truthy-string, 'select'?: PhpDb\Sql\Select, 'type'?: string}`.'''
 count = 1
 
+[[issues]]
+file = "src/Sql/Select.php"
+code = "possibly-undefined-string-array-index"
+message = 'Possibly undefined array key `null|string` accessed on `array<string, PhpDb\Sql\Select|PhpDb\Sql\TableIdentifier|string>`.'
+count = 1
+
 [[issues]]
 file = "src/Sql/Select.php"
 code = "redundant-comparison"
diff --git a/infection.json5.dist b/infection.json5.dist
index a91839b3..9297d843 100644
--- a/infection.json5.dist
+++ b/infection.json5.dist
@@ -22,6 +22,7 @@
                 // implode() discards keys, so array_fill()'s start index cannot be observed.
                 "PhpDb\\Sql\\Argument\\Identifiers::getSpecification",
                 "PhpDb\\Sql\\Argument\\Values::getSpecification",
+                "PhpDb\\Sql\\Ddl\\Constraint\\AbstractConstraint::getExpressionData",
                 "PhpDb\\Sql\\Ddl\\Constraint\\ForeignKey::getExpressionData"
             ]
         },
@@ -30,6 +31,7 @@
                 // implode() discards keys, so array_fill()'s start index cannot be observed.
                 "PhpDb\\Sql\\Argument\\Identifiers::getSpecification",
                 "PhpDb\\Sql\\Argument\\Values::getSpecification",
+                "PhpDb\\Sql\\Ddl\\Constraint\\AbstractConstraint::getExpressionData",
                 "PhpDb\\Sql\\Ddl\\Constraint\\ForeignKey::getExpressionData"
             ]
         },
diff --git a/src/Sql/AbstractSql.php b/src/Sql/AbstractSql.php
index d290bdab..e3540f77 100644
--- a/src/Sql/AbstractSql.php
+++ b/src/Sql/AbstractSql.php
@@ -17,13 +17,12 @@
 use PhpDb\Sql\Argument\Values;
 use PhpDb\Sql\Platform\PlatformDecoratorInterface;
 
+use function array_key_first;
 use function count;
-use function current;
 use function get_object_vars;
 use function implode;
 use function is_array;
 use function is_string;
-use function key;
 use function rtrim;
 use function str_replace;
 use function strtoupper;
@@ -343,8 +342,9 @@ protected function processJoin(
             $joinAs        = null;
             $joinNameValue = $join['name'];
             if (is_array($joinNameValue)) {
-                $joinName = current($joinNameValue);
-                $joinAs   = $platform->quoteIdentifier(key($joinNameValue));
+                $alias    = array_key_first($joinNameValue);
+                $joinName = $joinNameValue[$alias];
+                $joinAs   = $platform->quoteIdentifier($alias);
             } else {
                 $joinName = $joinNameValue;
             }
diff --git a/src/Sql/Ddl/Constraint/AbstractConstraint.php b/src/Sql/Ddl/Constraint/AbstractConstraint.php
index bea2ecee..687bba42 100644
--- a/src/Sql/Ddl/Constraint/AbstractConstraint.php
+++ b/src/Sql/Ddl/Constraint/AbstractConstraint.php
@@ -70,8 +70,8 @@ public function getExpressionData(): array
         if (0 !== $columnCount) {
             $columnSpec  = array_fill(0, count: $columnCount, value: '%s');
             $specParts[] = str_replace('%s', implode(', ', $columnSpec), $this->columnSpecification);
-            for ($i = 0; $i < $columnCount; $i++) {
-                $values[] = new Identifier($this->columns[$i]);
+            foreach ($this->columns as $column) {
+                $values[] = new Identifier($column);
             }
         }
 
diff --git a/src/Sql/Ddl/Index/Index.php b/src/Sql/Ddl/Index/Index.php
index 04597226..431b5f5a 100644
--- a/src/Sql/Ddl/Index/Index.php
+++ b/src/Sql/Ddl/Index/Index.php
@@ -8,7 +8,6 @@
 use PhpDb\Sql\Argument\Identifier;
 use PhpDb\Sql\Argument\Literal;
 
-use function count;
 use function implode;
 use function str_replace;
 
@@ -36,13 +35,12 @@ public function __construct(array|string|null $columns, ?string $name = null, ar
     #[Override]
     public function getExpressionData(): array
     {
-        $colCount  = count($this->columns);
         $values    = [new Identifier($this->name)];
         $specParts = [];
 
-        for ($i = 0; $i < $colCount; $i++) {
+        foreach ($this->columns as $i => $column) {
             $specPart = '%s';
-            $values[] = new Identifier($this->columns[$i]);
+            $values[] = new Identifier($column);
 
             if (null !== ($this->lengths[$i] ?? null)) {
                 $specPart .= "({$this->lengths[$i]})";
diff --git a/src/Sql/Select.php b/src/Sql/Select.php
index d761a95e..fe673016 100644
--- a/src/Sql/Select.php
+++ b/src/Sql/Select.php
@@ -12,8 +12,8 @@
 use PhpDb\Sql\Predicate\PredicateInterface;
 
 use function array_key_exists;
+use function array_key_first;
 use function count;
-use function current;
 use function explode;
 use function gettype;
 use function is_array;
@@ -650,7 +650,7 @@ protected function processSelect(
         }
 
         foreach ($this->getJoins()->getJoins() as $join) {
-            $joinName = is_array($join['name']) ? key($join['name']) : $join['name'];
+            $joinName = is_array($join['name']) ? array_key_first($join['name']) : $join['name'];
             $joinName = parent::resolveTable($joinName, $platform, $driver, $parameterContainer);
 
             foreach ($join['columns'] as $jKey => $jColumn) {
@@ -746,8 +746,8 @@ protected function resolveTable(
         $alias = null;
 
         if (is_array($table)) {
-            $alias = key($table);
-            $table = current($table);
+            $alias = array_key_first($table);
+            $table = $table[$alias];
         }
 
         $table = parent::resolveTable($table, $platform, $driver, $parameterContainer);
diff --git a/test/unit/Sql/Ddl/Constraint/PrimaryKeyTest.php b/test/unit/Sql/Ddl/Constraint/PrimaryKeyTest.php
index b656a204..51db9d7c 100644
--- a/test/unit/Sql/Ddl/Constraint/PrimaryKeyTest.php
+++ b/test/unit/Sql/Ddl/Constraint/PrimaryKeyTest.php
@@ -28,4 +28,21 @@ public function getExpressionData(): void
             $expressionData['values'],
         );
     }
+
+    #[Test]
+    public function getExpressionDataListsEveryColumnInTheSpecification(): void
+    {
+        $pk = new PrimaryKey(['foo', 'bar']);
+
+        $expressionData = $pk->getExpressionData();
+
+        static::assertSame('PRIMARY KEY (%s, %s)', $expressionData['spec']);
+        static::assertEquals(
+            [
+                Argument::identifier('foo'),
+                Argument::identifier('bar'),
+            ],
+            $expressionData['values'],
+        );
+    }
 }
diff --git a/test/unit/Sql/Ddl/Constraint/UniqueKeyTest.php b/test/unit/Sql/Ddl/Constraint/UniqueKeyTest.php
index 8eeef080..1da0f8e5 100644
--- a/test/unit/Sql/Ddl/Constraint/UniqueKeyTest.php
+++ b/test/unit/Sql/Ddl/Constraint/UniqueKeyTest.php
@@ -29,4 +29,22 @@ public function getExpressionData(): void
             $expressionData['values'],
         );
     }
+
+    #[Test]
+    public function getExpressionDataListsEveryColumnInTheSpecification(): void
+    {
+        $uk = new UniqueKey(['foo', 'bar'], 'my_uk');
+
+        $expressionData = $uk->getExpressionData();
+
+        static::assertSame('CONSTRAINT %s UNIQUE (%s, %s)', $expressionData['spec']);
+        static::assertEquals(
+            [
+                Argument::identifier('my_uk'),
+                Argument::identifier('foo'),
+                Argument::identifier('bar'),
+            ],
+            $expressionData['values'],
+        );
+    }
 }