然后发现群里还可以这样，也算是涨见识了吧，没想到order by里也可以这样用，以前都是用在 where 子查询和 select 子查询中
mysql有意思的order by 子查询
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mysql有意思的order by 子查询
t1.* from student t1
join (select sno,avg(score) avg_score from student group by t1.sno) t2
on t1.sno=t2.sno
order by t2.avg_score