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删除重复数据：
比如，某个表要按照id和name重复，就算重复数据
delete from 表名 where rowid not in (select min(rowid) from 表名 group by id,name);
如果以id，name和grade重复算作重复数据
delete from 表名 where rowid not in (select min(rowid) from 表名 group by id,name,grade);
注意：min也可用max替代
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 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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发表于 2020-6-29 17:34:37
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