获取用户消息列表的SQL

SELECT * from tb_user AS us INNER JOIN
(SELECT lxr,send_user_account,message_count,create_time,receipt_user_account,message_status,message_type,has_delete FROM (
		SELECT d.receipt_user_account as lxr,d.* from tb_chat_record d 
    	WHERE (d.send_user_account=YY_VdM9jBXyz') AND (d.receipt_user_account = 'YY_VdM9jBXyz') 
   	UNION
		SELECT e.send_user_account as lxr,e.* from tb_chat_record e
		where(e.send_user_account<>'YY_VdM9jBXyz') AND (e.receipt_user_account = 'YY_VdM9jBXyz')
		ORDER BY create_time DESC
) AS f WHERE message_status = 0
GROUP BY lxr,send_user_account,message_count,create_time,receipt_user_account,message_type,has_delete
ORDER BY MAX(create_time) DESC)AS mes WHERE us.user_account= mes.lxr