public ConditionInterface::notExists(SelectInterface $select)
Sets a condition that the specified subquery returns no values.
\Drupal\Core\Database\Query\SelectInterface $select: The subquery that must not contain results.
\Drupal\Core\Database\Query\ConditionInterface The called object.
public function notExists(SelectInterface $select);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Database!Query!ConditionInterface.php/function/ConditionInterface::notExists/8.1.x