Re: more on delete from join
From: paul c <toledobythesea_at_oohay.ac>
Date: Wed, 02 Sep 2009 18:23:48 GMT
Message-ID: <UKynm.43518$PH1.32018_at_edtnps82>
Date: Wed, 02 Sep 2009 18:23:48 GMT
Message-ID: <UKynm.43518$PH1.32018_at_edtnps82>
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.
> ...
Joe, if one does that, one is replacing the value of something other than the relations that form the join and it wouldn't actually be accurate to call it a "join update". To use the term "update", one is updating two relvars that point to subsets of the "base relvars". Received on Wed Sep 02 2009 - 20:23:48 CEST