SqlServer2005中使用row_number()在一个查询中删除重复记录

       在SqlServer2005中,提供了一个row_number()的函数,我们经常用它做DataBase数据分页.
下面我们来看下,如何利用它来删除一个表中重复记录:

If Exists(Select * From tempdb.Information_Schema.Tables Where Table_Name Like '#Temp%')
    Drop Table #temp

Create Table #temp ([Id] int, [Name] varchar(50), [Age] int, [Sex] bit default 1)
Go

Insert Into #temp ([Id] , [Name] , [Age] , [Sex] ) Values(1,'James',25,default)
Insert Into #temp ([Id] , [Name] , [Age] , [Sex] ) Values(1,'James',25,default)
Insert Into #temp ([Id] , [Name] , [Age] , [Sex] ) Values(1,'James',25,default)

Insert Into #temp ([Id] , [Name] , [Age] , [Sex] ) Values(2,'Lisa',24,0)
Insert Into #temp ([Id] , [Name] , [Age] , [Sex] ) Values(2,'Lisa',24,0)
Insert Into #temp ([Id] , [Name] , [Age] , [Sex] ) Values(2,'Lisa',24,0)

Insert Into #temp ([Id] , [Name] , [Age] , [Sex] ) Values(3,'Mirsa',23,0)
Insert Into #temp ([Id] , [Name] , [Age] , [Sex] ) Values(3,'Mirsa',23,0)
Insert Into #temp ([Id] , [Name] , [Age] , [Sex] ) Values(3,'Mirsa',23,0)

Insert Into #temp ([Id] , [Name] , [Age] , [Sex] ) Values(4,'John',26,default)
Insert Into #temp ([Id] , [Name] , [Age] , [Sex] ) Values(5,'Abraham',28,default)
Insert Into #temp ([Id] , [Name] , [Age] , [Sex] ) Values(6,'Lincoln',30,default)


Delete T From
(Select Row_Number() Over(Partition By [ID],[Name],[Age],[Sex] order By [ID]) As RowNumber,* From #Temp)T
Where T.RowNumber > 1


Select * From #temp

 

注意倒数第二句脚本,我们在一个查询实现这个功能.

你可以自己执行T-SQL script 看效果.希望对您开发有帮助!

 

作者：Petter Liu
出处：http://www.cnblogs.com/wintersun/
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