MySQLは、最後に送受信されたメッセージごとに連絡先の順序付きリストを取得します

解決済み 、このクエリは私のために働いた

SELECT messages.* FROM messages, (SELECT MAX(id) as lastid
                   FROM messages
                   WHERE (messages.receiver_id = '$myid' OR messages.sender_id = '$myid')

                   GROUP BY CONCAT(LEAST(messages.receiver_id,messages.sender_id),'.',
                   GREATEST(messages.receiver_id, messages.sender_id))) as conversations
                   WHERE id = conversations.lastid
                   ORDER BY messages.time DESC