Re: more on delete from join

From: paul c <>
Date: Wed, 26 Aug 2009 17:40:22 GMT
Message-ID: <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. Received on Wed Aug 26 2009 - 19:40:22 CEST

Original text of this message