select grantee_id, privilege from acs_permissions where object_id = :on_which_calendar update acs_activities set name = :name, description = :description where activity_id in ( select activity_id from acs_events where event_id = :cal_item_id ) select interval_id from timespans where timespan_id in ( select timespan_id from acs_events where event_id = :cal_item_id )