postgresql7.3 select msg_id, last_msg_id from (select paginate.* from ( select max(msg_id) as last_msg_id, parent_id as msg_id, folder_id, count(msg_id) as number_conversation from messages_user_messages where user_id = :user_id and msg_id in (select msg_id from messages_messages where community_id = :community_id and (owner_id in (select person_id from persons $where_clause_user) or msg_id in (select msg_id from messages_recipients where party_id in (select person_id from persons $where_clause_user)) $search_clause)) group by parent_id, folder_id order by last_msg_id desc ) paginate LIMIT :last_row) messages OFFSET :first_row - 1 select mm.last_msg_id, mm.msg_id, mm.number_conversation, mm.subject, concat(distinct(p.first_names)||',') as contacts, mm.folder_id from persons p, (select max(um.msg_id) as last_msg_id, um.parent_id as msg_id, count(um.msg_id) as number_conversation, m.subject, m.owner_id, um.folder_id from (select parent_id,msg_id, folder_id from messages_user_messages where user_id = :user_id) um, (select msg_id,subject,owner_id from messages_messages where community_id = :community_id and msg_id in ($msg_ids)) m where um.parent_id = m.msg_id group by um.parent_id, m.subject, m.owner_id, um.folder_id) mm where p.person_id = mm.owner_id group by mm.msg_id, mm.subject, mm.last_msg_id, mm.number_conversation, mm.folder_id order by mm.last_msg_id desc