oracle8.1.6 delete from bboard_forum_message_map bfm where message_id in (select message_id from acs_messages m connect by prior message_id = reply_to start with message_id = :message_id) and exists (select 1 from acs_object_party_privilege_map where object_id = bfm.message_id and party_id in (:user_id, -1) and privilege = 'bboard_delete_message')