ExtendableInterface

class \Drupal\Core\Database\Query\PagerSelectExtender extends \Drupal\Core\Database\Query\SelectExtender
class \Drupal\Core\Database\Query\Select extends \Drupal\Core\Database\Query\Query implements \Drupal\Core\Database\Query\SelectInterface uses \Drupal\Core\Database\Query\QueryConditionTrait
class \Drupal\Core\Database\Query\SelectExtender implements \Drupal\Core\Database\Query\SelectInterface
class \Drupal\Core\Database\Query\TableSortExtender extends \Drupal\Core\Database\Query\SelectExtender
class \Drupal\mysql\Driver\Database\mysql\Select extends \Drupal\Core\Database\Query\Select
class \Drupal\pgsql\Driver\Database\pgsql\Select extends \Drupal\Core\Database\Query\Select
class \Drupal\search\SearchQuery extends \Drupal\Core\Database\Query\SelectExtender
class \Drupal\search\ViewsSearchQuery extends \Drupal\search\SearchQuery
class \Drupal\sqlite\Driver\Database\sqlite\Select extends \Drupal\Core\Database\Query\Select