diff --git a/src/Column/ColumnDefinitionBuilder.php b/src/Column/ColumnDefinitionBuilder.php
index b0534999..0f2cb892 100644
--- a/src/Column/ColumnDefinitionBuilder.php
+++ b/src/Column/ColumnDefinitionBuilder.php
@@ -12,6 +12,9 @@ final class ColumnDefinitionBuilder extends AbstractColumnDefinitionBuilder
 {
     protected const AUTO_INCREMENT_KEYWORD = 'AUTOINCREMENT';
 
+    protected const GENERATE_UUID_EXPRESSION =
+        "(unhex(format('%016X', random() & 0xFFFFFFFFFFFF4FFF | 0x4000) || format('%016X', random() & 0xBFFFFFFFFFFFFFFF | 0xB000000000000000)))";
+
     protected const TYPES_WITH_SIZE = [
         'bit',
         'tinyint',
@@ -71,7 +74,7 @@ protected function buildNotNull(ColumnSchemaInterface $column): string
     protected function getDbType(ColumnSchemaInterface $column): string
     {
         /** @psalm-suppress DocblockTypeContradiction */
-        return match ($column->getType()) {
+        return $column->getDbType() ?? match ($column->getType()) {
             ColumnType::BOOLEAN => 'boolean',
             ColumnType::BIT => 'bit',
             ColumnType::TINYINT => $column->isAutoIncrement() ? 'integer' : 'tinyint',
@@ -83,7 +86,7 @@ protected function getDbType(ColumnSchemaInterface $column): string
             ColumnType::DECIMAL => 'decimal',
             ColumnType::MONEY => 'decimal',
             ColumnType::CHAR => 'char',
-            ColumnType::STRING => 'varchar',
+            ColumnType::STRING => 'varchar(' . ($column->getSize() ?? 255) . ')',
             ColumnType::TEXT => 'text',
             ColumnType::BINARY => 'blob',
             ColumnType::UUID => 'blob(16)',
diff --git a/tests/Provider/QueryBuilderProvider.php b/tests/Provider/QueryBuilderProvider.php
index 2e050c11..c3f89526 100644
--- a/tests/Provider/QueryBuilderProvider.php
+++ b/tests/Provider/QueryBuilderProvider.php
@@ -267,15 +267,15 @@ public static function buildColumnDefinition(): array
         $values[PseudoType::UPK][0] = 'integer PRIMARY KEY AUTOINCREMENT NOT NULL';
         $values[PseudoType::BIGPK][0] = 'integer PRIMARY KEY AUTOINCREMENT NOT NULL';
         $values[PseudoType::UBIGPK][0] = 'integer PRIMARY KEY AUTOINCREMENT NOT NULL';
-        $values[PseudoType::UUID_PK][0] = 'blob(16) PRIMARY KEY NOT NULL';
-        $values[PseudoType::UUID_PK_SEQ][0] = 'blob(16) PRIMARY KEY NOT NULL';
+        $values[PseudoType::UUID_PK][0] = "blob(16) PRIMARY KEY NOT NULL DEFAULT (unhex(format('%016X', random() & 0xFFFFFFFFFFFF4FFF | 0x4000) || format('%016X', random() & 0xBFFFFFFFFFFFFFFF | 0xB000000000000000)))";
+        $values[PseudoType::UUID_PK_SEQ][0] = "blob(16) PRIMARY KEY NOT NULL DEFAULT (unhex(format('%016X', random() & 0xFFFFFFFFFFFF4FFF | 0x4000) || format('%016X', random() & 0xBFFFFFFFFFFFFFFF | 0xB000000000000000)))";
         $values['primaryKey()'][0] = 'integer PRIMARY KEY AUTOINCREMENT NOT NULL';
         $values['primaryKey(false)'][0] = 'integer PRIMARY KEY NOT NULL';
         $values['smallPrimaryKey()'][0] = 'integer PRIMARY KEY AUTOINCREMENT NOT NULL';
         $values['smallPrimaryKey(false)'][0] = 'smallint PRIMARY KEY NOT NULL';
         $values['bigPrimaryKey()'][0] = 'integer PRIMARY KEY AUTOINCREMENT NOT NULL';
         $values['bigPrimaryKey(false)'][0] = 'bigint PRIMARY KEY NOT NULL';
-        $values['uuidPrimaryKey()'][0] = 'blob(16) PRIMARY KEY NOT NULL';
+        $values['uuidPrimaryKey()'][0] = "blob(16) PRIMARY KEY NOT NULL DEFAULT (unhex(format('%016X', random() & 0xFFFFFFFFFFFF4FFF | 0x4000) || format('%016X', random() & 0xBFFFFFFFFFFFFFFF | 0xB000000000000000)))";
         $values['uuidPrimaryKey(false)'][0] = 'blob(16) PRIMARY KEY NOT NULL';
         $values['money()'][0] = 'decimal(19,4)';
         $values['money(10)'][0] = 'decimal(10,4)';
@@ -284,6 +284,7 @@ public static function buildColumnDefinition(): array
         $values['binary()'][0] = 'blob';
         $values['binary(1000)'][0] = 'blob(1000)';
         $values['uuid()'][0] = 'blob(16)';
+        $values["check('value > 5')"][0] = 'integer CHECK (`col_59` > 5)';
         $values["comment('comment')"][0] = 'varchar(255) /* comment */';
         $values['integer()->primaryKey()'][0] = 'integer PRIMARY KEY NOT NULL';
         $values['unsigned()'][0] = 'integer';