关于一条SQl语句,该如何解决

关于一条SQl语句
Department表的结构如下 


departmentId parentId name masterId

1 0 总经办 1
2 1 事业单位 2
3 2 技术部 3
4 3 维护部 4


如果通过masterId得到它所在部门及所有下级子部门Id。。。。


如masterId = 1结果 :1234

masterId =3 结果 ：34
masterId = 2结果:234
 

[解决办法]

SQL code

-->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([departmentId] int)asbegin   insert @t select [departmentId] from [tbl] where [parentId]=@ParentID   while @@rowcount<>0   begin      insert @t select a.[departmentId] from [tbl] a inner join @t b      on a.[parentId]=b.[departmentId] and       not exists(select 1 from @t where [departmentId]=a.[departmentId])   end returnendgodeclare @id varchar(10)set @id=''select @id=@id+cast([departmentId] as varchar) from(select [departmentId]=1union allselect * from dbo.Uf_GetChildID(1))aprint @idselect @id as [departmentId]/*departmentId1234*/按照你的方式显示