SQL笔记---删除重复数据，保留第一个

删除重复数据，保留第一个

这里以删除 t_organization 的重复字段 为例：

delete from t_organization

where   name in (select
name    from t_organization group by
name      having count(name) > 1) 

and  
id not in (select min(id) from
t_organization group by name     having count(name)>1) 

只需将 t_organization 替换成 对应
表名 ，name 换成 判断重复 的字段。

如何报“对t_organization无效”错，则使用下面语句

将 databaseName
换成你的数据库名

use[databaseName]

go

delete from t_organization

where   name in (select name    from t_organization group by name      having count(name) > 1) 

and   id not in (select min(id) from t_organization group by name     having count(name)>1) 

go