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From: Alfredo Novoa <alfredo_novoa@hotmail.com>
Newsgroups: comp.databases.theory
Subject: Re: Does Codd's view of a relational database differ from that ofDate& Darwin? [M.Gittens]
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Date: Mon, 06 Jun 2005 16:19:18 +0200
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On Mon, 06 Jun 2005 14:48:35 +0100, Paul <paul@test.com> wrote:

>I guess the other claim against NULLs is that they make things more
>complex and less intuitive, which is a more subjective point. You could
>argue that Darwen's method of avoiding NULLs is more complex that using
>NULLs in the first place.

Nulls undermine the conceptual integrity of the Relational Model which
is based in predicate logic.

A tuple with nulls does not match to a logical proposition.

This causes many problems. Some of them were pointed by Eric.


Regards