Re: more on delete from join
Date: Wed, 02 Sep 2009 18:23:48 GMT
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 - 13:23:48 CDT