Oracle 向上递归、向下递归

---- 向上递归
select distinct orgguid,dtb_orgguid,orgname
  from dtba_organization a
  start with orgguid = '2117bc0897e543168fd9702216165c77'
  connect by prior dtb_orgguid = orgguid

orgguid 最小级别  

---- 向下递归
select distinct orgguid,dtb_orgguid,orgname
  from dtba_organization a
 start with dtb_orgguid = '5ca832cb82ed487d9b946890692529fe' 
connect by prior orgguid = dtb_orgguid 

dtb_orgguid  最大级别

--查询全部资源信息
select * from urm_class_info
--向上遍历树，找到路径直到根节点，指定的是parentid
select distinct classid,parentid,name
from urm_class_info
start with parentid = 'cmdb0000000000000017'
connect by prior parentid = classid
--向上遍历树，找到路径直到根节点，指定的是classid，和下面的主要区别就是parentid和classid的位置
select classid,parentid,name
from urm_class_info
start with classid = 'cmdb0000000000000401'
connect by prior parentid = classid
--向下遍历整棵树，可以指定classid，来遍历指定节点的树
select classid,parentid,name
from urm_class_info
start with classid = 'cmdb0000000000000017'
connect by prior classid = parentid
--向下遍历整棵树，可以指定parentid，来遍历指定parentid节点的树，不包含parentid
select classid,parentid,name
from urm_class_info
start with parentid = 'cmdb0000000000000017'
connect by prior classid = parentid