1、根據rowid來查詢重復數據

select * from table1 a where rowid !=(select max(rowid) from table1 b where a.name1=b.name1 )

2、根據rowid來刪除重復數據

delete from table1 a where rowid !=(select max(rowid) from table1 b where a.name1=b.name1 )

3、根據group by來查詢重復數據

select * from people where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1)

4、刪除表中多余的重復記錄，重復記錄是根據單個字段（Id）來判斷，只留有rowid最小的記錄

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

5、查找表中多余的重復記錄（多個字段），不包含rowid最小的記錄

select * from 表 a where (a.Id,a.seq) in (select Id,seq from 表 group by Id,seq having count(*) > 1) and rowid not in (select min(rowid) from 表 group by Id,seq having count(*)>1)

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