select s_id,group_concat(c_id) 课程 from sc
group by s_id having 课程
=(select group_concat(c_id)  from sc where s_id=\'01\' group by s_id )
and s_id<>01;

其实这个不是特别理解。。。感觉数据库的逻辑性好强啊，经常绕不过来
555后面复杂的好难消化