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我想在叶级别上使用条件执行分级查询。具有叶级别条件的Oracle递归分层查询
我想查询过滤所有父 - 子关系，其中叶级statisfies条件：ID LIKE '3％'
表t是：
ParentId,Id
INSERT INTO t VALUES ('VTE', 'VTP');
INSERT INTO t VALUES ('VTP', '202');
INSERT INTO t VALUES ('SER', '606');
INSERT INTO t VALUES ('SER', '609');
INSERT INTO t VALUES ('GIF', '301');
INSERT INTO t VALUES ('ECH', '302');
INSERT INTO t VALUES ('PUB', 'MER');
INSERT INTO t VALUES ('MER', '312');
INSERT INTO t VALUES ('MER', '313');
INSERT INTO t VALUES ('MER', '314');
INSERT INTO t VALUES ('MES', '318');
INSERT INTO t VALUES ('PUB', 'PRE');
INSERT INTO t VALUES ('PUB', 'PAP');
INSERT INTO t VALUES ('STA', '317');
INSERT INTO t VALUES ('NIV', 'ANS');
INSERT INTO t VALUES ('ZNM', '497');
INSERT INTO t VALUES ('ZNU', '496');
INSERT INTO t VALUES ('ANS', 'ZNC');
INSERT INTO t VALUES ('ZNC', '491');
INSERT INTO t VALUES ('NUL', 'NIV');
INSERT INTO t VALUES ('NIV', 'VTE');
INSERT INTO t VALUES ('VTE', 'VTC');
INSERT INTO t VALUES ('VTC', '100');
INSERT INTO t VALUES ('VTP', '204');
INSERT INTO t VALUES ('VTP', '205');
INSERT INTO t VALUES ('VTA', '500');
INSERT INTO t VALUES ('SER', '600');
INSERT INTO t VALUES ('NIV', 'PUB');
INSERT INTO t VALUES ('ECH', '303');
INSERT INTO t VALUES ('MER', '305');
INSERT INTO t VALUES ('MER', '306');
INSERT INTO t VALUES ('MER', '309');
INSERT INTO t VALUES ('PAP', '605');
INSERT INTO t VALUES ('SEP', 'PBC');
INSERT INTO t VALUES ('PBC', '601');
INSERT INTO t VALUES ('SEP', 'STA');
INSERT INTO t VALUES ('NIV', 'TRA');
INSERT INTO t VALUES ('ZNP', '498');
INSERT INTO t VALUES ('ANS', 'ZNM');
INSERT INTO t VALUES ('ANS', 'ZNE');
INSERT INTO t VALUES ('ANS', 'ZNR');
INSERT INTO t VALUES ('ZNR', '493');
INSERT INTO t VALUES ('ZNF', '492');
INSERT INTO t VALUES ('VTC', '101');
INSERT INTO t VALUES ('VTC', '102');
INSERT INTO t VALUES ('VTE', 'VTA');
INSERT INTO t VALUES ('VTE', 'SER');
INSERT INTO t VALUES ('AUT', '900');
INSERT INTO t VALUES ('PUB', 'CPR');
INSERT INTO t VALUES ('MER', '310');
INSERT INTO t VALUES ('MER', '311');
INSERT INTO t VALUES ('MER', '604');
INSERT INTO t VALUES ('PUB', 'MES');
INSERT INTO t VALUES ('MES', '316');
INSERT INTO t VALUES ('SEP', 'RSF');
INSERT INTO t VALUES ('RSF', '608');
INSERT INTO t VALUES ('TRA', 'TRP');
INSERT INTO t VALUES ('TRP', '603');
INSERT INTO t VALUES ('ANS', 'ZNP');
INSERT INTO t VALUES ('ANS', 'ZNU');
INSERT INTO t VALUES ('ANS', 'ZNG');
INSERT INTO t VALUES ('ANS', 'ZNF');
INSERT INTO t VALUES ('VTC', '104');
INSERT INTO t VALUES ('VTC', '105');
INSERT INTO t VALUES ('VTP', '200');
INSERT INTO t VALUES ('VTP', '201');
INSERT INTO t VALUES ('VTP', '203');
INSERT INTO t VALUES ('VTA', '400');
INSERT INTO t VALUES ('VTE', 'AUT');
INSERT INTO t VALUES ('CPR', '602');
INSERT INTO t VALUES ('PUB', 'GIF');
INSERT INTO t VALUES ('PUB', 'ECH');
INSERT INTO t VALUES ('MER', '307');
INSERT INTO t VALUES ('MER', '308');
INSERT INTO t VALUES ('PRE', '304');
INSERT INTO t VALUES ('PRE', '315');
INSERT INTO t VALUES ('NIV', 'SEP');
INSERT INTO t VALUES ('TRP', '607');
INSERT INTO t VALUES ('ANS', 'ZNA');
INSERT INTO t VALUES ('ZNA', '499');
INSERT INTO t VALUES ('ZNG', '495');
INSERT INTO t VALUES ('ZNE', '494');
COMMIT;
我initialy想我可以使用类似：
SELECT ParentId, Id
FROM t
WHERE id LIKE '3%'
start with ParentId ='NIV'
CONNECT BY PRIOR Id = ParentId
例如， 302的父亲是ECH ECH的父亲是PUB PUB的父亲是NIV
但查询只显示级别0的关系： 302的父亲是ECH
它丢弃所有的更高水平的根： ECH的父亲是PUB PUB的父亲是NIV
我想出了下面的解决方案。
但是，孩子父母循环是硬编码的，这会破坏分层查询的目的，其中自动识别子父母关系的数量。
SELECT parentid, id
FROM t
WHERE id IN
(SELECT parentid
FROM t
WHERE
id IN
(SELECT parentid
FROM t
WHERE id LIKE '3%'
start with parentid='NIV'
CONNECT BY PRIOR id = parentid)
start with parentid ='NIV'
CONNECT BY PRIOR id = parentid)
OR
ccomuse IN
(SELECT parentid
FROM t
WHERE id LIKE '3%'
start with parentid ='NIV'
CONNECT BY PRIOR id = parentid)
OR
id LIKE '3%'
start with parentid ='NIV'
CONNECT BY PRIOR id = parentid
有没有一种方法来提取所有的孩子 - 父母关系，而不用硬编码2内部循环，即用自动到达根的递归方法？
感谢您的建议。我可能忽视了一些东西，但我并不真正了解如何使用sys_connect_by_path（）函数根据叶级过滤器返回具有Child-Father关系的2列表。 – user2204154 2013-03-24 15:44:29