SQLServer删除重复行

概述1.如果有ID字段，就是具有唯一性的字段  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  select *

1.如果有ID字段，就是具有唯一性的字段 

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 

select * into #aa from table group by ID1,ID2,.... delete table insert into table select * from #aa 

3. 没有ID的情况 

 

select IDentity(int,1,1) as ID,* into #temp from tabel delect # where ID not in ( select max(ID) from # group by col1,col3...) delect table inset into table(...) select ..... from #temp 

　　

4. col1+‘,‘+col2+‘,‘...col5 联合主键 

 

select * from table where col1+‘,‘...col5 in ( select max(col1+‘,‘...col5) from table where having count(*)>1 group by col1,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. 

 

select IDentity(int,* into #temp from tabel select * from #temp where ID in ( select max(ID) from #emp where having count(*)>1 group by col1,col3...) 

6. 

 

select distinct * into #temp from tablename delete tablename go insert tablename select * from #temp sqlclub go drop table #temp 

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