SQL重复记录查询的几种方法

http://www.jb51.net/article/34820.htm

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1、查找表中多余的重复记录，重复记录是根据单个字段（peopleId）来判断

2、删除表中多余的重复记录，重复记录是根据单个字段（peopleId）来判断，只留有rowid最小的记录

delete from people
where peopleId in (select   peopleId from people group by   peopleId   having count

(peopleId) > 1)
and rowid not in (select min(rowid) from   people group by peopleId having count(peopleId

)>1)

SQL重复记录查询的几种方法

原文：http://www.cnblogs.com/LuoEast/p/7815172.html