RE: Academic ERDs vs. Professional ERDs
- From: "nelson flores" <nflores@xxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 8 Feb 2007 19:25:59 -0800
Jared,
The link that you point out still uses (very aptly for this list) the
standard Oracle notation. In general (and I use that term loosely),
common practice in a developers world (at least in mine) is still based
upon the usage of this notation to model data. UML is still a little
cumbersome to express what the data is supposed to represent (business
rules and such).
As tools go, Rational Rose is probably the best modeling tool I have
used, although I haven't used it since Uni.
Just my 2c...
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Jared Still
Sent: Sunday, February 08, 2004 9:25 AM
To: Oracle-L Freelists
Subject: RE: Academic ERDs vs. Professional ERDs
But of course, there is after all only one data model required;
http://www.tdan.com/i005fe03.htm
Everything else is fluff.
Jared
On Sat, 2004-02-07 at 20:16, TOMPKINS, MARGARET wrote:
> Just a guess but some of that may have come out of mathematical set =
> theory, sometimes called relational set theory. That at least dates =
> back to Venn diagrams.
> I have worked with groups that do nothing but data modeling either
in =
> tools like Designer or ERWin. They don't model to define requirements
=
> to be implemented. They data model - period. The biggest difference
=
> that I've seen in those and the "real" ones is an overuse of entity =
> subtyping. Entities that have eight levels of subtyping are beyond my
=
> comprehension. Maybe it's good that they don't get implemented.
Maggie
>
> Respectfully,
> > Maggie Tompkins - CAD SQA
> > Corporate Applications Division
> > Technology Services Organization - Kansas City
> > Defense Finance and Accounting Service
> > 816-926-1117 (DSN 465); Margaret.Tompkins@xxxxxxxx
>
>
> -----Original Message-----
> From: oracle-l-bounce@xxxxxxxxxxxxx
> [mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of Ryan
> Sent: Saturday, February 07, 2004 3:14 PM
> To: oracle-l@xxxxxxxxxxxxx
> Subject: Re: Academic ERDs vs. Professional ERDs
>
>
> They are very similiar to class diagrams which are used outside of =
> academia.
> ----- Original Message -----
> From: "Tim Gorman" <tim@xxxxxxxxxxxxx>
> To: <oracle-l@xxxxxxxxxxxxx>
> Sent: Saturday, February 07, 2004 2:55 PM
> Subject: Re: Academic ERDs vs. Professional ERDs
>
>
> > If it is not used outside of academia, then it is either ahead of
its =
> time
> > (due for general adoption) or of absolutely no practical use =
> whatsoever.
> >
> > Given that decision-tree, how long have these concepts been around?
=
> I'm
> > sure the footnotes have dates... :-)
> >
> >
> >
> >
> > on 2/7/04 9:47 AM, Ryan at ryan.gaffuri@xxxxxxx wrote:
> >
> > > I'm taking academic database classes and last semester we covered
> academic
> > > ERDs. The material in the book discussed 'entity sets' and =
> relationship
> sets.
> > > The relations between them seemed very similiar to relations in a
=
> class
> > > diagram.
> > > However, I when I look into Erwin and Designer the ERDs there seem
=
> to be
> > > closer to table models. Does anyone use the academic type of ERDs
> > > professionally?
> > >
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