Re: MV Keys
Date: Tue, 7 Mar 2006 10:54:24 +0200
Message-ID: <dujho2$q09$1_at_emma.aioe.org>
"Jon Heggland" <heggland_at_idi.ntnu.no> wrote in message
news:MPG.1e7754328c7e8f9e98978d_at_news.ntnu.no...
> In article <1141659383.465669.99320_at_u72g2000cwu.googlegroups.com>,
> marshall.spight_at_gmail.com says...
> > > I agree. Perhaps Marshall meant that if you have RVAs, you don't
really
> > > need tuple attributes, because you can "simulate" them using a RVA
with
> > > cardinality one (just like you can "simulate" a list using a
> > > relation)---not that a tuple is a special kind of relation?
> >
> > But isn't a tuple a subtype of a relation?
> Not according to the definitions I prefer. I feel uncomfortable with the
> circularity this would entail: That a relation is a set of relations(?).
Why are you afraid of circularity ?
> A tuple is a set of attribute name / domain / value triplets.
Funny word "triplets". Received on Tue Mar 07 2006 - 09:54:24 CET