在网上看到的，觉得有必要记录下。

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delete students as a from students as a,
(select * from students group by name having count(1)>1) as b
where a.name=b.name and a.id > b.id;

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达到了效果，就不知道效率如何。如果有更加好的方法，请赐教，不胜感激！