RE: SQL Brain Teaser Challenge

From: Madhavan Amruthur <mad5698_at_fastmail.fm>
Date: Wed, 06 Nov 2002 08:23:42 -0800
Message-ID: <F001.004FCC9B.20021106082342@fatcity.com>

Hi Steve,
You can get the below query to work in 8.1.7 (not sure about previous versions) by setting the undoc parameter _new_connect_by_enabled = true and can be set for a session

SELECT *
FROM (SELECT * FROM treenode ORDER BY parentid, nodeorder) START WITH parentid=0
CONNECT BY PRIOR ID = parentid

You can also use sys_connect_by_path feature in 9i which gives you the entire hierarchy path (can be used in 8i with the above undoc parameter)

For eg:

select sys_connect_by_path(parent_id,'/') from treenode
start with parent_id = 0
connect by prior id = parent_id

will give you a output like

0/1/9
0/1/2
0/1/2/4

...etc

As always setting an undoc parameter is not advisable unless instructed by Oracle support :-)

Hope this helps.
Regards,

Madhavan
http://www.dpapps.com

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Madhavan Amruthur
DecisionPoint Applications

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Author: Madhavan Amruthur
  INET: mad5698_at_fastmail.fm

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