oralce 层次遍历树

select

brp.BRANCHNAME "省公司" ,brp.BRANCHCODE "省机构代码",brp.BRANCHID  "省机构ID"

from branch brp

start with brp.branchid='BRA0000000000001'

--BRANCHID 机构代码

--parentbranchid 上级机构代码

connect by prior brp.branchid=brp.parentbranchid;