oracle 遞迴查詢 Oracle遞迴查詢

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;

2.1、查詢所有子節點

select *from districtstart with name ='巴中市'connect by prior id=parent_id

2.2、查詢所有父節點

select *from districtstart with name ='平昌縣'connect by prior parent_id=id

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 dwhere 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

select id,parent_id,name,sys_connect_by_path(name,'->') namepath,levelfrom district start with name='巴中市'connect by prior id=parent_id

with t (id ,parent_id,name) --要有列名as(select id ,parent_id,name from district where name='巴中市'union allselect 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 allselect 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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