树型hierarchyid类型

--查询所有下级
DECLARE @BOSS hierarchyid
SELECT @BOSS=orgNode FROM subjectClass WHERE ID=1011
SELECT *,orgNode.ToString() as org FROM subjectClass WHERE orgNode.IsDescendantOf(@BOSS)=1 and valid=1
--查询所有上级
DECLARE @Employee hierarchyid
SELECT @Employee=orgNode FROM subjectClass WHERE ID=11749
SELECT *,orgNode.GetLevel()AS Level FROM subjectClass WHERE @Employee.IsDescendantOf(orgNode)=1 and valid=1

--查询下级
DECLARE @node HIERARCHYID
SELECT @node=node FROM sys_area WHERE code=''
SELECT *,node.ToString()[nodet] FROM sys_area WHERE node.IsDescendantOf(@node)=1
GO
DECLARE @node HIERARCHYID=HIERARCHYID::Parse('/24/')
SELECT *,node.ToString()[nodet] FROM sys_area WHERE node.IsDescendantOf(@node)=1