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Re: where clause

From: Mladen Gogala <mladen_at_wangtrading.com>
Date: Fri, 6 Feb 2004 15:19:16 -0500
Message-ID: <20040206201916.GC5779@mladen.wangtrading.com>


On 02/06/2004 03:07:41 PM, Wolfgang Breitling wrote:
> NULL is NULL. It is not equal anything and it is not unequal
> anything.
> It
> is just NULL
>

Actually, I've noticed that many people have problems with ternary logic, where condition can be false, true and null. I'd put every relational database designer thru a course of the Zermelo-Frankel set theory. I know that relational databases are based on naive set theory (Cantor's theory) but Z-F with "axiom of choice" would teach them to excercise unusual way of thinking. It would very interesting to see the results and reactions.....



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Received on Fri Feb 06 2004 - 14:19:16 CST

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