一般大家也许会碰到这个问题，大家可以参考下，讲的比较详细
比如，表：event（id int（10） auto_increment primary key，
sid int（10）not null，
detail text）文章源自很文博客https://www.hinven.com很文博客-https://www.hinven.com/59449.html
我想删除表event中sid重复的记录，请问有没有这样SQL语句？或是通过其它方法？文章源自很文博客https://www.hinven.com很文博客-https://www.hinven.com/59449.html
- delete from event as e
- where id != (select min(id) from event where sid=e.sid);
or文章源自很文博客https://www.hinven.com很文博客-https://www.hinven.com/59449.html
- delete from event
- where sid not in (select mid from (select sid ,min(id) as mid from event group by sid))
应该是有用的代码文章源自很文博客https://www.hinven.com很文博客-https://www.hinven.com/59449.html
- alter ignore table event add unique index idu_sid (sid);
- alter table event drop index idu_sid;
文章源自很文博客https://www.hinven.com很文博客-https://www.hinven.com/59449.html 文章源自很文博客https://www.hinven.com很文博客-https://www.hinven.com/59449.html
我的微信
扫一扫更精彩
大家的支持是我更新的动力！！！
评论