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Recursive SQL Query

597564Oct 20 2010 — edited Oct 20 2010
Hi guys,

I have the following table:
SELECT node_from, node_to
  FROM nodes;
This table contains the following records:
NODE_FROM    NODE_TO

GT	TG
GG	GC
AT	TG
TG	GC
GC	CG
TG	GG
GC	CA
CG	GT
Represented graphically:

http://esser.hopto.org/temp/image1.JPG

My goal is to "span out" from a specific node, given a level:

http://esser.hopto.org/temp/image2.JPG

I produced the following query to attempt to find nodes at level 2:
SELECT node_from, node_to
  FROM nodes
 WHERE level <= 2
START WITH node_from = 'AT'
CONNECT BY NOCYCLE (PRIOR node_to) = node_from	
GROUP BY node_from, node_to;
However I'm missing a relationship (GT -> TG):
NODE_FROM     NODE_TO

TG	 GC
AT	 TG
TG	 GG
Represented graphically:

http://esser.hopto.org/temp/image3.JPG

Thank you for your time!!!!
This post has been answered by Aketi Jyuuzou on Oct 20 2010
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Locked on Nov 17 2010
Added on Oct 20 2010
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