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在SQL数据库中，经常会遇到重复记录的情况，那么就需要SQL删除重复记录，下面为您列举了四种SQL删除重复记录的方式，用于不同的情况，希望对您有所启迪。
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
- select * from people
- where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1)
2、SQL删除重复记录，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)
3、查找表中多余的重复记录（多个字段）
- select * from vitae a
- where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1)
4、删除表中多余的重复记录（多个字段），只留有rowid最小的记录
- delete from vitae a
- where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1)
- and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1)
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