表如下
field1 field2
A1 a1
A1 a2
a1 aa1
a2 aa2
aa1 aaa1
field1是field2的上级，我希望查询所有field1的下级。 比如当field1为A1时，查询到field2为a1,a2,aa1,aa2,aaa1
------解决方案--------------------
- SQL code
-->Title:Generating test data-->Author:wufeng4552-->Date :2009-09-30 08:52:38set nocount onif object_id('tb','U')is not null drop table tbgocreate table tb(ID int, ParentID int)insert into tb select 1,0 insert into tb select 2,1 insert into tb select 3,1 insert into tb select 4,2 insert into tb select 5,3 insert into tb select 6,5 insert into tb select 7,6-->Title:查找指定節點下的子結點if object_id('Uf_GetChildID')is not null drop function Uf_GetChildIDgocreate function Uf_GetChildID(@ParentID int)returns @t table(ID int)asbegin insert @t select ID from tb where [email protected] while @@rowcount<>0 begin insert @t select a.ID from tb a inner join @t b on a.ParentID=b.id and not exists(select 1 from @t where id=a.id) end returnendgoselect * from dbo.Uf_GetChildID(5)/*ID-----------67*/-->Title:查找指定節點的所有父結點if object_id('Uf_GetParentID')is not null drop function Uf_GetParentIDgocreate function Uf_GetParentID(@ID int)returns @t table(ParentID int)asbegin insert @t select ParentID from tb where [email protected] while @@rowcount!=0 begin insert @t select a.ParentID from tb a inner join @t b on a.id=b.ParentID and not exists(select 1 from @t where ParentID=a.ParentID) end returnendgoselect * from dbo.Uf_GetParentID(2)/*ParentID-----------10*/本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/wufeng4552/archive/2009/09/30/4619995.aspx参考资料