分享SQL Server刪除反復行的6個辦法。本站提示廣大學習愛好者：（分享SQL Server刪除反復行的6個辦法）文章只能為提供參考，不一定能成為您想要的結果。以下是分享SQL Server刪除反復行的6個辦法正文
1.假如有ID字段，就是具有獨一性的字段
delect table where id not in (
select max(id) from table group by col1,col2,col3...
)
group by 子句後跟的字段就是你用來斷定反復的前提，如只要col1，那末只需col1字段內容雷同即表現記載雷同。
2. 假如是斷定一切字段也能夠如許
select * into #aa from table group by id1,id2,....
delete table
insert into table
select * from #aa
3. 沒有ID的情形
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 結合主鍵
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 子句後跟的字段就是你用來斷定反復的前提，如只要col1，那末只需col1字段內容雷同即表現記載雷同。
5.
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.
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刪除反復行的辦法引見。
