sql server 数据库问题
有一个语句查询出的结果是
a
b
c
d
....
怎么把查询的结果变成啊a,b,c,d这种样式？
[解决办法]

----------------------------------------------------------------
-- Author  :DBA_Huangzj()
-- Date    :2013-12-05 15:33:30
-- Version:
--      Microsoft SQL Server 2012 (SP1) - 11.0.3128.0 (X64) 
--Dec 28 2012 20:23:12 
--Copyright (c) Microsoft Corporation
--Enterprise Edition (64-bit) on Windows NT 6.2 <X64> (Build 9200: )
--
----------------------------------------------------------------
--> 测试数据：#huang
if object_id('tempdb.dbo.#huang') is not null drop table #huang
go 
create table #huang([col] varchar(1))
insert #huang
select 'a' union all
select 'b' union all
select 'c' union all
select 'd'
--------------开始查询--------------------------
select DISTINCT 
stuff((select ','+col from #huang b 
       for xml path('')),1,1,'') 'col'
from #huang a

----------------结果----------------------------
/* 
col
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
a,b,c,d
*/

if object_id('tb') is not null
   drop table tb
go


create table tb([col] varchar(1))
insert tb
select 'a' union all
select 'b' union all
select 'c' union all
select 'd'
go

declare @t varchar(100)

select @t = ISNULL(@t,'') + ','+col
from tb a

select stuff(@t,1,1,'')
/*
a,b,c,d
*/

create table #table(name varchar(20))

insert into #table
select 'a' union all
select 'b' union all
select 'c' union all
select 'd' 

select STUFF((
select ','+name from #table for xml path('')),1,1,'')

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
a,b,c,d

(1 行受影响)