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hierarchical relationship, how to query
Posted by: Ronald Veloo
Date: March 31, 2009 01:06AM

HI,

I've got the following data in my table:

P_KEY = 1 REL_KEY = NULL
P_KEY = 2 REL_KEY = 1
P_KEY = 3 REL_KEY = 2

I only know P_KEY = 3.
How should I write my query to obtain the highest level of the hierarchy, P_KEY = 1? Here are 3 levels, but levels can be more or less.

Thankx, Ronald.

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