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1.取得不重复的数据
select * from Persons where Id in ( SELECT MAX(Id) AS Expr1 FROM Persons GROUP BY Name, Gender )
2.删除重复的数据【MAX换成MIN会有不同的效果】
delete from Persons where Id not in ( SELECT MAX(Id) AS Expr1 FROM Persons GROUP BY Name, Gender )
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原文地址：http://www.cnblogs.com/zuqing/p/4878856.html
