sql 中对分组的信息进行聚合。（sql server 2005）

with t as(
select 1 id, 'Child1' child
union
select 1 id, 'Child2'
union
select 1 id, 'Child3'
union
select 2 id, 'Child1'
union
select 2 id, 'Child2'
)

select id, stuff((select ','+child
                 from t a
                 where b.id = a.id
                 for xml path('')),1,1,'') children
from t b group by id