1、查找表中多余的重复记录，重复记录是根据单个字段（Id）来判断

select * from 表 where Id in (selectId from 表 group byId having count(Id) > 1)

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

DELETE from 表 WHERE (id) IN (SELECT id FROM 表 GROUP BY id HAVING COUNT(id) > 1)AND ROWID NOT IN (SELECT MIN(ROWID) FROM 表 GROUP BY idHAVING COUNT(*) > 1);

3、查找表中多余的重复记录（多个字段）

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

5、查找表中多余的重复记录（多个字段），不包含rowid最小的记录

select * from 表 a where (a.Id,seq having count(*)>1)

原创作者：UncleToo