Re: The relational model is a wrong theory

Dana petak, 11. listopada 2019. u 15:00:36 UTC+2, korisnik Roy Hann napisao je:
> vldm10 wrote:
>
> > Dana utorak, 8. listopada 2019. u 20:14:05 UTC+2, korisnik James K. Lowden napisao je:
> >> On Mon, 7 Oct 2019 08:38:52 -0700 (PDT)
> >> vldm10 <vldm10_at_yahoo.com> wrote:
> >>
> >> > A man named John Smith had black hair in 2010. In 2019, his hair was
> >> > white. According to Codd's Relational model, these are two different
> >> > people.
> >>
> >> I would like to think you're being provocative just to breath some life
> >> into c.d.t. You don't truly believe what you wrote, right?
> >
> >>
> >> Codd refers to the phenomenon of
> >> "changing over time" in his 1970 paper.
> >
> > I can tell you that my grandmother said the same thing as you quoted E. Codd.
> > But she's certainly older than Codd, so the priority for that idea
> > belongs to her.
>
> You have just illustrated why a set of values has no intrinsic meaning.
> The intended meaning can be interpreted successfully only with respect
> to the agreed predicate that everyone shares. The RM takes this as
> given.
>
> I would like to think you did it deliberately, in which case, neatly
> done sir. Unfortunately it doesn't illustrate the claim you are making
> in the subject heading so it is probably an accident.
>
> Roy
>
> PS: I second James' gratitude to you for reviving c.d.t. Just try not to
> gnaw on too many imaginary bones.
Received on Sun Oct 13 2019 - 05:27:31 CEST