南宁关键词网站排名,中山平面设计公司,iis8.5安装wordpress,如何使用表格做网站1、查找表中多余的重复记录#xff0c;重复记录是根据单个字段#xff08;Id#xff09;来判断 select * from 表 where Id in (select Id from 表 group byId having count(Id) 1) 2、删除表中多余的重复记录#xff0c;重复记录是根据单个字段#xff08;Id#x…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) 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 id HAVING 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 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) 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,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)转载于:https://www.cnblogs.com/bingrong/p/4968422.html
