请问大大们，这样的查询语句应该要怎样写？？
SELECT `t1`.*,`t2`.`nickname`,`t2`.`head` FROM `p_message` `t1` INNER JOIN `P_user` `t2` ON `t1`.`muid`=`t2`.`uid` WHERE `t1`.`muid` = 11 AND `t1`.`uid` = 13 OR `t1`.`muid` = 13 AND `t1`.`uid` = 11