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