select count(*) from na_aggregators a, acs_objects o where a.aggregator_id = o.object_id and o.creation_user = :user_id select a.aggregator_name from na_aggregators a, acs_objects o where o.object_id = a.aggregator_id and a.aggregator_id != :aggregator_id and o.creation_user = :user_id select s.title, s.source_id from na_sources s where source_id not in (select source_id from na_subscriptions where aggregator_id = :aggregator_id)