Re: Domain

"Bob Badour" <bbadour_at_golden.net> skrev i en meddelelse news:mfGdnV-2Nadl2mqiRVn-vA_at_golden.net...
> "Adrian Kubala" <adrian_at_sixfingeredman.net> wrote in message
> news:slrnbve73f.ta3.adrian_at_sixfingeredman.net...
> > Bob Badour <bbadour_at_golden.net> schrieb:
> > > As long as the dbms treats values strictly as values at the logical
> > > level, all values are atomic. A dbms would violate atomicity if it
> > > exposes internal structure with concepts such as a current position
> > > within the value, for instance.
> >
> > I don't think it's so clear-cut. What's the difference between a
> > function "value -> current position within value" and a function "date
> > -> month"?
>
> Month is a derivable value from any date value. Since values have no
> locations, a current position within a value is an absurdity.
>
>
> > What if cons cells were used for all non-scalar types. Would
> > car and cdr "expose internal structure"?
>
> Since there are no non-scalar types, I have difficulty finding any meaning
> in your question.
>
>
What about "what is the value of the fourth character in the last name"?

Kind regards
Peter Received on Sun Jan 04 2004 - 11:39:05 CET