oracle递归查询记录

1. start with  开始的id  connect by prior 开始的id=父id

2. level 级别

3.实例

select * from (

select a.*,level tt from biz_district a start with district_id=8 connect by prior district_id=parent_id

) where tt=3

select a.district_id,

a.district_name,

b.district_id   as district_id_1,

b.district_name as distract_name_1

from (select * from biz_district where parent_id = 8) a

left join (select *

from (select a.*, level tt

from biz_district a

start with district_id = 8

connect by prior district_id = parent_id)

where tt = 3) b

on a.district_id = b.parent_id

oracle递归查询记录