Mysql去重三种语句

2022-06-13 02:21:12

1.存在完全相同的纪录

select distinct * from table(表名) where (条件)

2.存在部分字段相同的纪录（有主键id即唯一键）

select * from table where id in (select max(id) from table group by [去除重复的字段名列表,....])

3.没有唯一键ID

   select identity(int,1,1) as id,* into newtable(临时表) from table

   select * from newtable where id in (select max(id) from newtable group by [去除重复的字段名列表,....])

   drop table newtable

Mysql去重三种语句