Re: more on delete from join

From: Mr. Scott <>
Date: Wed, 26 Aug 2009 15:21:00 -0400
Message-ID: <>

"paul c" <> wrote in message news:aselm.42716$PH1.28409_at_edtnps82...
> Kevin Kirkpatrick wrote:
> ...
>> By the narrowest interpretation of RT, shouldn't the whole "view
>> update" problem just be tossed out once and for all? Tuples in base
>> relvars represent business meaningful propositions, and tuples in
>> virtural relvars represent business meaningful conclusions drawn from
>> base relvar propositions. As such, view updates amount to letting
>> end-users assert conclusions and having the DBMS make "educated
>> guesses" at the appropriate modifications to business meaningful
>> propositions such that those conclusions will be reached. Seems
>> inherently mystical to me.
>> ...
> Insert to a base relvar represents a conclusion: R =: R UNION A conludes R
> AND A.
It concludes R OR A. R AND A would be just A, provided A is in R. Received on Wed Aug 26 2009 - 21:21:00 CEST

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