Re: object algebra

From: Eric Kaun <ekaun_at_yahoo.com>
Date: Wed, 03 Mar 2004 13:10:33 GMT
Message-ID: <dPk1c.55374$tJ6.38160@newssvr33.news.prodigy.com>

"Neo" <neo55592_at_hotmail.com> wrote in message news:4b45d3ad.0402281204.79458b78_at_posting.google.com...
> I re-read Chapter 20 of 6th Ed. It does not indicate that NULLs aren't
> an integral part of RDM?

No, it does not.

> Since he spends an entire chapter on the
> source of NULLs, the consequences of NULLs and how to deal with NULLs
> by replacing them with "disciplined default values", I would conclude
> that NULLs are an integral part of RDM and masking the problem with
> "disciplined default values" is the only practical/partial solution.
> If NULLs weren't an integral part of RDM, he could simply drop Chapter
> 20.

You're confusing missing information and nulls. Nulls are a bad solution to the very real problem of missing information. The title of the chapter is Missing Information, right? Missing Information != NULL. Received on Wed Mar 03 2004 - 07:10:33 CST