Re: more on delete from join

From: Joe Thurbon <>
Date: Wed, 02 Sep 2009 22:07:58 GMT
Message-ID: <op.uzng3kbuq7k8pw_at_imac.local>

On Thu, 03 Sep 2009 01:12:02 +1000, Marshall <> wrote:

> On Sep 2, 2:44 am, "Joe Thurbon" <> 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

I agree. Although when I have a bit of time on my hands I would like to see how far the analogy can be pushed.

Joe Received on Wed Sep 02 2009 - 17:07:58 CDT

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