Re: object algebra

From: Neo <neo55592_at_hotmail.com>
Date: 25 Feb 2004 13:54:46 -0800
Message-ID: <4b45d3ad.0402251354.17d9d72f_at_posting.google.com>

> I never heard any statement to the effect that Codd said NULLs
> were *required.*

C. J. Date's "An Introduction to Database Systems" 6th Edition. ISBN 0-201-54329-X
Chapter 5, Section 5.6 - Nulls (A Digresssion), pg 123

"Codd now regards nulls as an integral part of the relational model" Received on Wed Feb 25 2004 - 22:54:46 CET

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