mysql重复数据去重 Mysql如何去掉数据库中的重复记录？

Mysql如何去掉数据库中的重复记录？

很简单 通过id删除

DELETE

FROM

table_name AS ta

WHERE

ta.唯一键 <> (

SELECT

t.maxid

FROM

( SELECT max( tb.唯一键 ) AS maxid FROM table_name AS tb WHERE ta.判断重复的列 = tb.判断重复的列 ) t

)

mysql查找删除重复数据并只保留一条实例详解？

delete from `mygame_article` where title in (select title from `mygame_article` group by id having count(title) > 1) and id not in (select max(id) from `mygame_article` group by title having count(title) > 1) 随手写了个，前半句是选择title重复的数据，后半句是剔除id最大的，delete是删除的意思。。应该 思路是没问题的，这边不方便帮您测试

Mysql数据库中多条重复数据，如何只删除一条？

列出要保留的记录ID，可以把这个结果写到一个临时表t1中： SELECT MAX(id) AS max_id FROM pedigree GROUP BY number然后：DELETE FROM pedigree WHERE id NOT IN (SELECT id FROM t1)也就是：delete from pedigree where id not in(select * from pedigree where group by number)。pedigree where id not in(select max(id) from pedigree where group by number having count(id) > 0) 查询结果是否符合删除要求！

mysql重复数据去重 sql重复数据只保留一条 如何删除重复项保留一条数据

版权声明：本文内容由互联网用户自发贡献，本站不承担相关法律责任.如有侵权/违法内容,本站将立刻删除。