標籤:oracle遞迴查詢
----建立資料
1.1、建立表與插入資料
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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;
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二、start with connect by prior遞迴
查詢所有子節點
SELECT *
FROM district
START WITH NAME =‘巴中市‘
CONNECT BY PRIOR ID=parent_id
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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
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2.3、查詢指定節點的,根節點
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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
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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
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三、with遞迴
3.1、with遞迴子類
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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;
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3.2、遞迴父類
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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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Oracle遞迴查詢