public static function drop_foreign_key($table, $fk_name)
	{
		$sql = 'ALTER TABLE ';
		$sql .= \DB::quote_identifier(\DB::table_prefix($table, static::$connection)).' ';
		$sql .= 'DROP FOREIGN KEY '.\DB::quote_identifier($fk_name);

		return \DB::query($sql, \DB::UPDATE)->execute();
	}