分享SQLServer删除重复行的6个方法

SQL Server删除重复行是我们最常见的操作之一，下面就为您介绍六种适合不同情况的SQL Server删除重复行的方法，供您参考。

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 
 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 
 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 
 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. 
 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. 
 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。