sql server多行数据拼接

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

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