order by a desc,b desc与order by a,b desc的区别
表为： 通过下面sql看出 order by 默认是asc 。相当于select * from order_table order by id1 asc 通过下面两个图可知， select * from order_table order by id1,id2 desc不等于 select * from order_table order by id1 desc,id2 desc. select
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