group by与order by连用的问题介绍
在写sql 语句的时候,一定要将group by 放在order by 之前
如select * from table wherename='xx' group by sid order by id;
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group by与order by连用的问题介绍
在写sql 语句的时候,一定要将group by 放在order by 之前
如select * from table wherename='xx' group by sid order by id;