Re: object algebra
From: Neo <neo55592_at_hotmail.com>
Date: 23 Feb 2004 15:09:22 -0800
Message-ID: <4b45d3ad.0402231509.48edf2a0_at_posting.google.com>
Date: 23 Feb 2004 15:09:22 -0800
Message-ID: <4b45d3ad.0402231509.48edf2a0_at_posting.google.com>
> > "Codd now regards NULLs as an integral part of RDM".
>
> Codd was wrong in that statement,
Codd is correct that NULLs are required in RDM, unless all your data fits neatly in rectangular tables which is not the general case, or unless one resorts to unpractical methods such as generic modelling (ie all data in one table with one column).
> and many relational proponents support the non-use of nulls.
The occurence of NULLs when applying RDM in the general case doesn't depend on what proponents support. It depends on the model. Received on Tue Feb 24 2004 - 00:09:22 CET