Start - and connect SQL to the lowest level in the tree or the hierarchy

Hello

In a tree structure as shown below how can I get all the child (tree) level lowest records as a - E, H, G, and D.
A a B, C, D to level 2
B E and F at level 3, and C G at level 3
F a H level 4

A
| l | l | l
B C D
| l | l | l
E F G
| l
H

I have used start with and coonect by to give all levels of the tree as follows: -.
SELECT task_id, parent_task_id, top_task_id, level
OF pa_tasks
WHERE project =: p
START WITH parent_task_id IS NULL
CONNECT BY PRIOR task_id = parent_task_id

Thank you

Published by: user10648285 on October 17, 2011 23:42

Published by: user10648285 on October 17, 2011 23:42

Published by: user10648285 on October 17, 2011 23:42

Published by: user10648285 on October 17, 2011 23:43

Oracle a [url http://download.oracle.com/docs/cd/E11882_01/server.112/e26088/pseudocolumns001.htm#i1009313] nickname for hierarchical queries:

SELECT task_id,parent_task_id, top_task_id,level
FROM pa_tasks
WHERE project_id = :bind_variable
and connect_by_isleaf = 1
START WITH parent_task_id IS NULL
CONNECT BY PRIOR task_id = parent_task_id

Tags: Database

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