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1.È¡×ӽڵ㼰·¾¶(ÕýÊ÷):
select t.id ,t.code, t.name ,t.pid
,SYS_CONNECT_BY_PATH(t.id,'.')||'.' as IdPath
from tas_catalog t
--where id!=110
start with id=110
connect by  pid = prior id
order siblings  by id
2.È¡¸÷¼¶¸¸½Úµã(µ¹Ê÷)£º
select t.id ,t.code, t.name ,t.pid
,SYS_CONNECT_BY_PATH(t.id,'.')||'.' as IdPath --·¾¶´Ó·´µÄ
from tas_catalog t
--where id!=110
start with id=110
connect by  id = prior pid
order siblings  by id
ÎÞÂÛÕýÊ÷»¹Êǵ¹Ê÷, ¹Ø¼ü¾ÍÔÚÓÚconnect byµÄÌõ¼þ.
ÕýÊ÷:   ±ØÐëÊÇ   ‘¸¸’= prior ‘×Ó’
µ¹Ê÷:   ±ØÐëÊÇ   ‘×Ó’= prior ‘¸¸’


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