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Re: Date of Birth as an attribute

From: Alan <alan_at_erols.com>
Date: Wed, 7 Apr 2004 12:23:09 -0400
Message-ID: <c519t9$2n05mj$1@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 - 11:23:09 CDT

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