function SelectInterface::getUnion

Returns a reference to the union queries for this query.

This includes queries for UNION, UNION ALL, and UNION DISTINCT.

Because this method returns by reference, alter hooks may edit the tables array directly to make their changes. If just adding union queries, however, the use of the union() method is preferred.

Note that this method must be called by reference as well:

$fields =& $query->getUnion();

Return value

array A reference to the union query array structure.

2 methods override SelectInterface::getUnion()

Select::getUnion in core/lib/Drupal/Core/Database/Query/Select.php: Returns a reference to the union queries for this query.
SelectExtender::getUnion in core/lib/Drupal/Core/Database/Query/SelectExtender.php: Returns a reference to the union queries for this query.

File

core/lib/Drupal/Core/Database/Query/SelectInterface.php, line 124

Class

SelectInterface: Interface definition for a Select Query object.

Namespace

Drupal\Core\Database\Query

Code

public function &getUnion();