Re: Date of Birth as an attribute

Whoa, hold on a second! I didn't know that people were allowed to agree in this group. Doesn't that violate the charter or something?

"Tom Hester" <$$tom_at_metadata.com> wrote in message news:47a40$40743624$45033832$17539_at_msgid.meganewsservers.com...
> Yeah, me too. So, I would call the schema an implementation model.
>
> "Alan" <alan_at_erols.com> wrote in message
> news:c519t9$2n05mj$1_at_ID-114862.news.uni-berlin.de...
> > To me, "physical model", or "relational schema" is an expression of the
> > implementation in the RDBMS.
> >
> >
> > "Tom Hester" <$$tom_at_metadata.com> wrote in message
> > news:d50d6$40742393$45033832$16071_at_msgid.meganewsservers.com...
> > > Certainly calling the relational model the logical model makes both
> > > practical and theoretical sense; and calling the ER-level the
conceptual
> > > model makes sense too, although I personally prefer requirements model
> or
> > > analysis model as I think it is clearer and more accurate depending on
> > > whether the model simply records requirements or represents some kind
of
> > > business analysis. However, I find physical model to be vague and
> > > misleading. Do you mean implementation model, or do you mean the
actual
> > > implementation syntax, or? In what sense is the physical model
> physical?
> > >
> > > "Laconic2" <laconic2_at_comcast.net> wrote in message
> > > news:reednQMCbKLdkund4p2dnA_at_comcast.com...
> > > > Just a terminology question, I can point it out without making a
> > mountain
> > > > out of a mole hill.
> > > >
> > > > I've always seen the "ER" model listed as the "conceptual model"
> rather
> > > > than the "logical model".
> > > >
> > > > In this framework, you first turn the ER conceptual model into a
> > > relational
> > > > logical model, and then turn the logical model into a physical
model.
> > > >
> > > > It's an extra step, but I think it buys you something.
> > > >
> > > > Again, I don't want to make a mountain out of a mole hill. The
rows
> by
> > > any
> > > > other name would smell as sweet.
> > > >
> > > >
> > >
> > >
> >
> >
>
>
Received on Wed Apr 07 2004 - 21:03:23 CEST