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Add a GROUP BY clause to the query.
API Docs: xPDOQuery::groupby()
xPDOQuery groupby (string $column, [string $direction = ''])
Grab the different 'type's of Boxes with at least one Box of width 15.
$query = $xpdo->newQuery('Box'); $query->where(array( 'width' => 15, )); $query->groupby('type'); $boxes = $xpdo->getCollection('Box',$query);