oracle 递归查询 CONNECT BY、START WITH、CONNECT_BY_ROOT、CONNECT_BY_ISLEAF、SYS_CONNECT_BY_PATH
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转载自:http://blog.csdn.net/feier7501/article/details/21815691
创建表,初始化数据;
- CREATE TABLE TB_COMPANY
- (
- COMPANY_ID INTEGER PRIMARY KEY,
- COMPANY VARCHAR2(256),
- UP_COMPANYID INTEGER
- );
- INSERT INTO TB_COMPANY VALUES (0, '总公司', NULL);
- INSERT INTO TB_COMPANY VALUES (1, '北京分公司', 0);
- INSERT INTO TB_COMPANY VALUES (2, '上海分公司', 0);
- INSERT INTO TB_COMPANY VALUES (3, '海淀区分部', 1);
- INSERT INTO TB_COMPANY VALUES (4, '东城区分部', 1);
- INSERT INTO TB_COMPANY VALUES (5, '黄埔区分部', 2);
- INSERT INTO TB_COMPANY VALUES (6, '静安区分部', 2);
- COMMIT;
全部数据:
递归查询SQL:
- SELECT (RPAD(' ', 2*(LEVEL-1), '-' ) || COMPANY) COMPANY_NAME, CONNECT_BY_ROOT COMPANY, CONNECT_BY_ISLEAF, LEVEL , SYS_CONNECT_BY_PATH(COMPANY, '/')
- FROM TB_COMPANY
- START WITH UP_COMPANYID IS NULL
- CONNECT BY PRIOR COMPANY_ID = UP_COMPANYID;
结果:
说明:
1. CONNECT_BY_ROOT 返回当前节点的最顶端节点
2. CONNECT_BY_ISLEAF 判断是否为叶子节点,如果这个节点下面有子节点,则不为叶子节点
3. LEVEL 伪列表示节点深度
4. SYS_CONNECT_BY_PATH函数显示详细路径,并用“/”分隔
递归查询SQL:
- SELECT * FROM TB_COMPANY START WITH COMPANY_ID = 1 CONNECT BY PRIOR COMPANY_ID = UP_COMPANYID;
结果:
0 0
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