一、建立資料
1.1、建立表與插入資料
create table district
( id number(10) not null,
parent_id number(10),
name varchar2(255 byte) not null
);alter table district add (
constraint district_pk
primary key
(id));
alter table district add (
constraint district_r01
foreign key (parent_id)
references district (id));
insert into district (id, parent_id, name)
values (1, null, '四川省');
insert into district (id, parent_id, name)
values (2, 1, '巴中市');
insert into district (id, parent_id, name)
values (3, 1, '達州市');
insert into district (id, parent_id, name)
values (4, 2, '巴州區');
insert into district (id, parent_id, name)
values (5, 2, '通江縣');
insert into district (id, parent_id, name)
values (6, 2, '平昌縣');
insert into district (id, parent_id, name)
values (7, 3, '通川區');
insert into district (id, parent_id, name)
values (8, 3, '宣漢縣');
insert into district (id, parent_id, name)
values (9, 8, '塔河鄉');
insert into district (id, parent_id, name)
values (10, 8, '三河鄉');
insert into district (id, parent_id, name)
values (11, 8, '胡家鎮');
insert into district (id, parent_id, name)
values (12, 8, '南壩鎮');
insert into district (id, parent_id, name)
values (13, 6, '大寨鄉');
insert into district (id, parent_id, name)
values (14, 6, '響灘鎮');
insert into district (id, parent_id, name)
values (15, 6, '龍崗鎮');
insert into district (id, parent_id, name)
values (16, 6, '白衣鎮');
commit;
二、start with connect by prior遞迴
2.1、查詢所有子節點
select *
from district
start with name ='巴中市'
connect by prior id=parent_id
2.2、查詢所有父節點
select *
from district
start with name ='平昌縣'
connect by prior parent_id=id
只需要交換 id 與parent_id的位置即可
2.3、查詢指定節點的，根節點
select d.*,
connect_by_root(d.id),
connect_by_root(name)
from district d
where name='平昌縣'
start with d.parent_id=1 --d.parent_id is null 結果為四川省
connect by prior d.id=d.parent_id
2.4、查詢巴中市下行政組織遞迴路徑
select id,parent_id,name,
sys_connect_by_path(name,'->') namepath,
level
from district
start with name='巴中市'
connect by prior id=parent_id
三、with遞迴
3.1、with遞迴子類
with t (id ,parent_id,name) --要有列名
as(select id ,parent_id,name from district where name='巴中市'
union all
select d.id ,d.parent_id,d.name from t,district d --要指定表和列表，
where t.id=d.parent_id
)select * from t;
3.2、遞迴父類
with t (id ,parent_id,name) --要有表
as(select id ,parent_id,name from district where name='通江縣'
union all
select d.id ,d.parent_id,d.name from t,district d --要指定表和列表，
where t.parent_id=d.id
)select * from t;
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