Re: A new proof of the superiority of set oriented approaches: numerical/time serie linear interpolation
From: Bob Badour <bbadour_at_pei.sympatico.ca>
Date: Wed, 02 May 2007 16:59:13 -0300
Message-ID: <4638ed61$0$4049$9a566e8b_at_news.aliant.net>
>>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.
Date: Wed, 02 May 2007 16:59:13 -0300
Message-ID: <4638ed61$0$4049$9a566e8b_at_news.aliant.net>
> 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?
Yes, I misspoke. A single relvar with an empty key.
I have no idea what you mean by "safer".