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