sql 根据关系表查找相应的父子类的数据

Create Table A
(ID Int,
 fatherID Int,
 Name Varchar(10)
)
Insert A Select 1,        NULL,       'tt'
union   All Select 2,        1,          'aa'
union   All Select 3,        1,          'bb'
union   All Select 4,        2,          'cc'
union   All Select 5,        2,          'gg'
union   All Select 6,        4,          'yy'
union   All Select 7,        4,          'jj'
union   All Select 8,        7,           'll'
union   All Select 9,        NULL,  'uu'
union   All Select 10,       9,         'oo'
GO
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
GO
create Function [dbo].[GetParent](@ID Int)
Returns @Tree Table (ID Int, fatherID Int, Name Varchar(10))
As
Begin
Insert @Tree Select ID, fatherID, Name From A Where ID = @ID
While @@Rowcount > 0
Insert @Tree Select A.ID, A.fatherID, A.Name From A A Inner Join @Tree B On A.ID = B.fatherID And A.ID Not In (Select ID From @Tree)
Return
End

--測試
Select * From dbo.GetParent(4)