1.如果有ID字段，就是具有唯一性的字段

复制代码 代码如下:

delect table where id not in (

select max(id) from table group by col1,col2,col3...

)

group by 子句后跟的字段就是你用来判断重复的条件，如只有col1，那么只要col1字段内容相同即表示记录相同。

2. 如果是判断所有字段也可以这样

复制代码 代码如下:

select * into #aa from table group by id1,id2,....

delete table

insert into table

select * from #aa

3. 没有ID的情况

复制代码 代码如下:

select identity(int,1,1) as id,* into #temp from tabel

delect # where id not in (

select max(id) from # group by col1,col2,col3...)

delect table

inset into table(...)

select ..... from #temp

4. col1+','+col2+','...col5 联合主键

复制代码 代码如下:

select * from table where col1+','+col2+','...col5 in (

select max(col1+','+col2+','...col5) from table

where having count(*)>1

group by col1,col2,col3,col4

)

group by 子句后跟的字段就是你用来判断重复的条件，如只有col1，那么只要col1字段内容相同即表示记录相同。

5.

复制代码 代码如下:

select identity(int,1,1) as id,* into #temp from tabel

select * from #temp where id in (

select max(id) from #emp where having count(*)>1 group by col1,col2,col3...)

6.

复制代码 代码如下:

select distinct * into #temp from tablename

delete tablename

go

insert tablename select * from #temp Sqlclub

go

drop table #temp

以上就是SQL Server删除重复行的方法介绍。