数据库输出数据问题,把数据集转换成字符串

[xiefie1989]

select tId from a
--上面查询出来的是一个数据集,我现在要把他用字符串的形式输出(print) 该怎么写?

[Xiao_Ai_Mei]

declare @s varchar(8000)

select @s=isnull(@s+',','')+tId FROM A 

PRINT @S 

[rucypli]

declare @s varchar(max)

[--小F--]

----------------------------------------------------
/*如何将一列中所有的值一行显示
数据源
  a
  b
  c
  d
  e
结果
a,b,c,d,e
*/

create table tb(col varchar(20))
insert tb values ('a')
insert tb values ('b')
insert tb values ('c')
insert tb values ('d')
insert tb values ('e')
go

--方法一
declare @sql varchar(1000)
set @sql = ''
select @sql = @sql + t.col + ',' from (select col from tb) as t
set @sql='select result = ''' + left(@sql , len(@sql) - 1) + ''''
exec(@sql)
/*
result     
---------- 
a,b,c,d,e,
*/

--方法二
declare @output varchar(8000)
select @output = coalesce(@output + ',' , '') + col from tb
print @output
/*
a,b,c,d,e
*/

---方法三
declare @s varchar(1000)
select @s=isnull(@s+',' , '')+col from tb
select @s
/*
a,b,c,d,e
*/

drop table tb


-------------

[pd00]

select [tId]=stuff((select '、'+ [tId]  from a for xml path('')), 1, 1, '') 

[xiefie1989]

  with a as(
	select tId, tName, tpId from S_OEMType where tId='1'
	union all
	select x.tId,x.tName,x.tpId from S_OEMType as x,a 
	where x.tpId=a.tId
        )
	declare @s varchar(max)
	select @s=isnull(@s+',','')+tId FROM A
	PRINT @S 

报错....难道因为是虚表递归?