sql server多行數據拼接的實例方法

1.表結構
id type productCode
1 鉛筆 0001
2 鉛筆 0002
3 鉛筆 0003
4 鋼筆 0004
5 鋼筆 0005
6 鋼筆 0004
7 圓珠筆 0007
8 圓珠筆 0008
9 圓珠筆 0007
2.自定義函數fun
復制代碼 代碼如下:
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

3.查詢語句
select type,dbo.fun(type) from (select distinct type from T) A
結果:
鋼筆   0004,0005
鉛筆   0001,0002,0003
圓珠筆   0007,0008