1.表结构
id type productCode
1 铅笔 0001
2 铅笔 0002
3 铅笔 0003
4 钢笔 0004
5 钢笔 0005
6 钢笔 0004
7 圆珠笔 0007
8 圆珠笔 0008
9 圆珠笔 0007
2.自定义函数fun
复制代码 代码如下:
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.查询语句
select type,dbo.fun(type) from (select distinct type from T) A
结果:
钢笔   0004,0005
铅笔   0001,0002,0003
圆珠笔   0007,0008