Re: MV Keys

From: David Cressey <dcressey_at_verizon.net>
Date: Thu, 02 Mar 2006 13:33:35 GMT
Message-ID: <PuCNf.675$ZL1.646@trndny09>

"Jon Heggland" <heggland_at_idi.ntnu.no> wrote in message news:MPG.1e710df6ce57e677989771_at_news.ntnu.no...
> In article <ZpvNf.36309$Jd.13462_at_newssvr25.news.prodigy.net>,
> brian_at_selzer-software.com says...
> > A tuple is a set of named values. It is not a type. It is an element
of a
> > relation.
>
> In the spirit of sharing opinions: A tuple is not a type, but a tuple
> *has* a type. It is very convenient to have tuple types (and relation
> types) when doing database programming.
> --

Thanks.

If you have set types and tuple types, do you need to define relations separately as a type? Can't you merely define a relation as a set of tuples? Or is that, in itself, a type definition? Received on Thu Mar 02 2006 - 07:33:35 CST