Re: more on delete from join

From: Marshall <marshall.spight_at_gmail.com>
Date: Wed, 2 Sep 2009 08:12:02 -0700 (PDT)
Message-ID: <badf422a-cd2b-40f1-869b-c0a248363088_at_u36g2000prn.googlegroups.com>



On Sep 2, 2:44 am, "Joe Thurbon" <use..._at_thurbon.com> wrote:
>

> So, to update a view, rather than update the conclusion directly, one must  
> update (one of) the base relvars that are used to derive the  
> conclusion/view. That is abductive.

I guess I see what you mean, but strictly speaking it doesn't seem to fit the definition. In abductive reasoning, one knows a -> b, and b, but one doesn't know that it was in fact a that implied b. Whereas with a view, we do know.

Marshall Received on Wed Sep 02 2009 - 10:12:02 CDT

Original text of this message