The group you are posting to is a Usenet group. Messages posted to this group will make your email address visible to anyone on the Internet.
Your reply message has not been sent.
Your post was successful
From: Jan Hidders <jan.hidd...@REMOVETHIS.pandora.be>
Date: Sat, 04 Jun 2005 09:30:15 GMT
Local: Sat, Jun 4 2005 5:30 am
Subject: Re: Does Codd's view of a relational database differ from that of Date & Darwin? [M.Gittens]
mountain man wrote:NULLs are an abstraction and like all abstractions they do not really
> There have been, there are,
exist. The relevant question here is if they are necessary and useful to
describe the world.
> Does this fact not conflictThey unnecessarily complicate the model. Anything that can be modeled
> with Date's wants, and if
> so, why does Date want
> to ignore them?
with them can also be modeled without them, and to the extent that they
are convenient this is mostly due to the fact that the possibilities for
user-defined domains were too restricted.
-- Jan Hidders
You must Sign in before you can post messages.
To post a message you must first join this group.
Please update your nickname on the subscription settings page before posting.
You do not have the permission required to post.