create table #tb(id int, value varchar(10),cname varchar(20))
insert into #tb values(1, 'aa','aaaa')
insert into #tb values(1, 'bb','eeee')
insert into #tb values(1, 'aa','tttt')
insert into #tb values(2, 'aaa','gggg')
insert into #tb values(2, 'bbb',null)
insert into #tb values(2, 'ccc','hhhh')
insert into #tb values(1, 'cc','llll')
go
----
---去重
select id, [value] = stuff((select distinct ',' + [value] from #tb t where id = #tb.id for xml path('')) , 1 , 1 , ''),max(isnull(cname,''))
from #tb
group by id
---不去重
select id, [value] = stuff((select ',' + [value] from #tb t where id = #tb.id for xml path('')) , 1 , 1 , ''),max(isnull(cname,''))
from #tb
group by iddrop table #tb
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