[SQL]把同一字段里的多行数据用一行显示

declare @t table(id int,num int)
insert @t
select , union all
select , union all
select ,
--select * from @t

----查询
declare @idList varchar(),@numList varchar()
set @idList = ''
set @numList = ''
select
@idList = case @idList when '' then '' else @idList + ',' end + rtrim(id),
@numList = case @numList when '' then '' else @numList + ',' end + rtrim(num)
from @t

select @idList as id,@numList as num

/*结果
id      num
------------------
1,2,3   2,4,6
*/