Re[2]: Union quries: INTERSECT, MINUS, etc

From: Jonathan Gennick <jonathan_at_gennick.com>
Date: Thu, 24 Jul 2003 10:13:13 -0400
Message-Id: <26007.339433@fatcity.com>

Thursday, July 24, 2003, 10:09:25 AM, Dave wrote: DP> Compared actual result set
DP> with expected result set via minus.

I've done that too. I need to search the cobwebs of my memory a bit, but I recall having use MINUS both ways to be sure:

results MINUS expected_results

tells you whether the real results included any rows that are unexpected

expected_results MINUS results

tells you whether results omitted any expected rows

I seem to recall once having to use GROUP BY and COUNT to ensure that the *right quantity* of each row was in the result set.

Best regards,

Jonathan Gennick --- Brighten the corner where you are http://Gennick.com * 906.387.1698 * mailto:jonathan@gennick.com

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