oracle递归树形结构sql

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例如:

--向下遍历

select * from tablename  START WITH id=  '111' CONNECT BY id=parentid 

--不包含parentid

select * from tablename  START WITH parentid=  '111' CONNECT BY id=parentid 

--向上遍历 

select * from tablename  START WITH id=  '111' CONNECT BY parentid =id

--不包含parentid

select * from tablename  START WITH parentid=  '111' CONNECT BY parentid =id