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)
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