public SelectInterface::groupBy($field)
Groups the result set by the specified field.
$field: The field on which to group. This should be the field as aliased.
\Drupal\Core\Database\Query\SelectInterface The called object.
public function groupBy($field);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Database!Query!SelectInterface.php/function/SelectInterface::groupBy/8.1.x