Re: MV Keys
From: David Cressey <dcressey_at_verizon.net>
Date: Thu, 02 Mar 2006 14:57:18 GMT
Message-ID: <iJDNf.676$ZL1.483_at_trndny09>
Date: Thu, 02 Mar 2006 14:57:18 GMT
Message-ID: <iJDNf.676$ZL1.483_at_trndny09>
"Jon Heggland" <heggland_at_idi.ntnu.no> wrote in
> > Repeating groups are still a bad idea, regardless of whether we
> > allow nested relations or not. I don't agree that allowing
> > nested relations means we're going to want to start using
> > repeating groups.
>
> How do you define "repeating group" as opposed to "nested relation",
> then? I assume "nested relation" and "relation-valued attribute" is the
> same thing.
This reminds me of the definition of "tuple" set forth elsewhere.
Is a"tuple valued attribute" the same thing as a "relation valued attribute, constrained to a cardinality of one"? Received on Thu Mar 02 2006 - 15:57:18 CET