function Select::union

Overrides SelectInterface::union

File

core/lib/Drupal/Core/Database/Query/Select.php, line 690

Class

Select

Query builder for SELECT statements.

Namespace

Drupal\Core\Database\Query

Code

public function union(SelectInterface $query, $type = '') {
    // Handle UNION aliasing.
    switch ($type) {
        // Fold UNION DISTINCT to UNION for better cross database support.
        case 'DISTINCT':
        case '':
            $type = 'UNION';
            break;
        case 'ALL':
            $type = 'UNION ALL';
        default:
    }
    $this->union[] = [
        'type' => $type,
        'query' => $query,
    ];
    return $this;
}