Re: c.d.theory glossary - RELATION

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"mAsterdam" <mAsterdam_at_vrijdag.org> wrote in message news:4092779f$0$562$e4fe514c_at_news.xs4all.nl...

> >>>If yes, those _things_ are explicitly or implicitly represented
> >>>in relational model ? And by what ? Why not otherwise.
> >>
> >>Assuming yes about the first question:
> >>'represent' would be 'explicit', imho.
> >>By what? By the propositions (by means of the predicates).
> >>
> >>As I said: just thinking out loud.
> >
> >
> > fact: John likes Mary.
> > Which proposition represents John ?
>
> The proposition "John likes Mary" represents John.
> Indirectly, but explicitly. Like so:

> "John likes Mary" would be in the body of a relation.
> It's predicate would be (short) "<Person> likes <Person>".

Why we don't directly represent John in the database ?

> Are you sure he likes her?
Well, I don't know if he is sure ...
Are we talking about same people ?

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