sql server多行数据拼接的实例方法

GO
/****** Object:  UserDefinedFunction [dbo].[fun]    Script Date: 11/22/2011 16:09:45 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
Create function [dbo].[fun](@type nvarchar(10))
returns nvarchar(200)
as
begin
    declare @re nvarchar(200)
    declare @code nvarchar(200)
    set @re=''
    set @code=''
    select @re=@re+productCode+',' from T where type=@type group by productCode
    select @re=left(@re, len(@re)-1)
    return @re
end