Re: quick FK question

  • From: Rumpi Gravenstein <rgravens@xxxxxxxxx>
  • To: "Mark W. Farnham" <mwf@xxxxxxxx>
  • Date: Mon, 21 Dec 2009 09:47:55 -0500

<snip>
So, does your "data warehouse modeler" produce models that work well to
answer the questions put to it? Does this practice tend to make the models
more or less usable?
</snip>

I just want to be clear here.  The foreign keys do tie into records in
the dimension table that have a meaning of unknown.

The answer to the question is that by and large yes, the final result
is very usable.  Discoverer and other reports run against it where the
"unknown" dimension value can easily be selected and the report run.
One never has to worry about when might an outer join be necessary.
And because this is a data warehouse, with data refreshed daily, as
the unknown values become known, the newly loaded values start
reflecting those facts.


-- 
Rumpi Gravenstein
--
http://www.freelists.org/webpage/oracle-l


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