Re: A new proof of the superiority of set oriented approaches: numerical/time serie linear interpolation
From: Jon Heggland <jon.heggland_at_idi.ntnu.no>
Date: Wed, 02 May 2007 21:30:48 +0200
Message-ID: <f1ap0a$iak$1_at_orkan.itea.ntnu.no>
>
> If one accepts the idea of relation valued attributes, then one could
> look at the dbms as a single tuple with a 0-ary candidate key and an RVA
> for each relvar.
Date: Wed, 02 May 2007 21:30:48 +0200
Message-ID: <f1ap0a$iak$1_at_orkan.itea.ntnu.no>
Bob Badour wrote:
> Gene Wirchenko wrote:
>> Cimode <cimode_at_hotmail.com> wrote: >>> On May 2, 11:18 am, Jon Heggland <jon.heggl..._at_idi.ntnu.no> wrote: >>>> you could say (as D&D do) that a database is a variable---a >>>> dbvar---which has a db value. Which is a tuple. >> >>> Stating that a database is a relation is much safer. >> >> But likely inaccurate. It may (and probably will) consist of more >> than one relation.
>
> If one accepts the idea of relation valued attributes, then one could
> look at the dbms as a single tuple with a 0-ary candidate key and an RVA
> for each relvar.
A single relvar, you mean? Tuples don't have keys. Is a relvar with an empty key safer than a tuple variable? What does "safer" mean?
-- JonReceived on Wed May 02 2007 - 21:30:48 CEST