一张person表,有id和name的两个字段,id是唯一的不允许重复,id相同则认为是重复的记录。
select id from group by id having count(*) > 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 (select Id from 表 group byId having count(Id) > 1)
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 id HAVING COUNT(*) >1);
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)
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 having
count() > 1) and rowid not in (select min(rowid) from 表 group by Id,seq
having count()>1)
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)
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