話不多說(shuō)，請(qǐng)看代碼：

if not object_id('Tempdb..#T') is null
 drop table #T
Go
Create table #T([ID] int,[Name] nvarchar(1),[Memo] nvarchar(2))
Insert #T
select 1,N'A',N'A1' union all
select 2,N'A',N'A2' union all
select 3,N'A',N'A3' union all
select 4,N'B',N'B1' union all
select 5,N'B',N'B2'
Go 

--I、Name相同ID最小的記錄(推薦用1,2,3),保留最小一條

方法1:

delete a from #T a where  exists(select 1 from #T where Name=a.Name and IDa.ID)

方法2:

delete a from #T a left join (select min(ID)ID,Name from #T group by Name) b on a.Name=b.Name and a.ID=b.ID where b.Id is null

方法3:

delete a from #T a where ID not in (select min(ID) from #T where Name=a.Name)

方法4(注:ID為唯一時(shí)可用):

delete a from #T a where ID not in(select min(ID)from #T group by Name)

方法5:

delete a from #T a where (select count(1) from #T where Name=a.Name and IDa.ID)>0

方法6:

delete a from #T a where ID>(select top 1 ID from #T where Name=a.name order by ID)

方法7:

delete a from #T a where ID>any(select ID from #T where Name=a.Name)
select * from #T

以上就是本文的全部?jī)?nèi)容，希望本文的內(nèi)容對(duì)大家的學(xué)習(xí)或者工作能帶來(lái)一定的幫助，同時(shí)也希望多多支持腳本之家！