分享SQL Server重複資料刪除行的6個方法

1.如果有ID欄位，就是具有唯一性的欄位 複製代碼 代碼如下:delect table where id not in (
select max(id) from table group by col1,col2,col3...
)

group by 子句後跟的欄位就是你用來判斷重複的條件，如只有col1，那麼只要col1欄位內容相同即表示記錄相同。

2. 如果是判斷所有欄位也可以這樣 複製代碼 代碼如下:select * into #aa from table group by id1,id2,....
delete table
insert into table
select * from #aa

3. 沒有ID的情況 複製代碼 代碼如下: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 聯合主鍵 複製代碼 代碼如下: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 子句後跟的欄位就是你用來判斷重複的條件，如只有col1，那麼只要col1欄位內容相同即表示記錄相同。

5. 複製代碼 代碼如下: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. 複製代碼 代碼如下: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重複資料刪除行的方法介紹。