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ÎÊÌ⣺һ¸ö±íÓÐ×ÔÔöµÄID
ÁУ¬±íÖÐÓÐһЩ¼Ç¼ÄÚÈÝÖØ¸´£¬Ò²¾ÍÊÇ˵ÕâЩ¼Ç¼³ýÁËID
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ÄêµÄʱºòһλOracle
DBA
½Ðm.l·¢¸ø¼¼Êõ²¿È«ÌåµÄ£¨¿ÉϧԭʼÓʼþÕÒ²»µ½ÁË£¬Òª²»È»ÎÒµ±ÎÄÎï·¢¸ø´ó¼Ò£©£º
delete from Score
where [sid] not in (
select min([sid])
from Score
group by [sid],[sname],[score])
 
·½·¨¶þ£ºz.benÔÚÍøÂçÉÏËѳöÀ´µÄ£º
--
ɾ³ýÏàͬ³ÇÊÐϵÄÏàͬÐÐÕþÇø
delete a from Score a
where a.sid>(
select min(sid) from Score b
where a.sname=b.sname and a.score=b.score)
·½·¨Èý£ºÊ¹ÓÃsql
2005
ÐÂÔöµÄrow_number()
¹¦ÄܺÍwith
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print('ɾ³ýScore±íÖÐÖØ¸´µÄ¼Ç¼')
;WITH a AS (
SELECT ROW_NUMBER() OVER (PARTITION BY [sid],[sname],[score]
ORDER BY [sid],[sname],[score]) AS rn,*
from Score
)
delete from a WHERE a.rn>1
 
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USE [DBtest]
GO
/****** Object:  Table [dbo].[Score]    Script Date: 01/13/2010 23:47:56 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Score](
    [sid] [int] IDENTITY(1,1) NOT NULL,
    [sname] [nchar](10) NOT NULL,
    [score] [nchar](10) NOT NULL,
 CONSTRAINT [PK_Score] PRIMARY KEY CLUSTERED
(
    [sid] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
 
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