Oracle遞迴查詢

標籤：

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 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

 

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 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

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,LEVELFROM 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 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;

 

Oracle遞迴查詢