SELECT `id` FROM `table` WHERE `published`='1' AND ( `parent` = '1' OR `parent`='2')
$c= $modx->newQuery('modResource', 'web'); $c->select('id'); $c->where(array( '`modResource`.parent' => 1, )); $c->orCondition(array( '`modResource`.parent' => 2, )); $c->andCondition(array( '`modResource`.published' => 1, '`modResource`.context_key' => 'web', )); $collection = $modx->getCollection('modResource', $c);