Oracle用Start with...Connect By子句递归查询

Oracle用Start with...Connect By子句递归查询(转自其它blog)
2009-01-20 09:13
Start with...Connect By子句递归查询一般用于一个表维护树形结构的应用。
创建示例表：
CREATE TABLE TBL_TEST
(
ID    NUMBER,
NAME VARCHAR2(100 BYTE),
PID   NUMBER                                  DEFAULT 0
);

插入测试数据：
INSERT INTO TBL_TEST(ID,NAME,PID) VALUES('1','10','0');
INSERT INTO TBL_TEST(ID,NAME,PID) VALUES('2','11','1');
INSERT INTO TBL_TEST(ID,NAME,PID) VALUES('3','20','0');
INSERT INTO TBL_TEST(ID,NAME,PID) VALUES('4','12','1');
INSERT INTO TBL_TEST(ID,NAME,PID) VALUES('5','121','2');

从Root往树末梢递归
select * from TBL_TEST
start with id=1
connect by prior id = pid

从末梢往树ROOT递归
select * from TBL_TEST
start with id=5
connect by prior pid = id

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