Re: Has E/R had a negative impact on db?


"JOG" <jog@xxxxxxxxxxxxx> wrote in message
news:1145759385.737434.153510@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Neo wrote:
Just a thought. I don't like entities. In fact I despise entities, as
the enemy of good
information philosophy.

What is your definition of an entity? What steps would one go through
to verify something is an entity?

I refer to them as they are specified by Chen. I've already pointed out
I believe their specification is impossible above simply being
arbitrary so your second question makes no sense to me.


I honestly believe that this long discussion has lost sight of the idea that
the E/R model is an analysis model, and not a design model. Arbitrary
choices made during the analysis phase can be useful, in order to come up
with a conceptual model that is easily communicated from one person to
another. That's the main usefulness of an E/R model, IMO. If the E/R model
were a design model, then arbitrary choices would be far more costly.

Arbitrary choices during the design phase can (will) come back to bite you
if those choices were only arbitrary in your mind, and not in terms of the
downstream consequences of the design choice.

Many of the complaints made against undereducated database designers can be
grouped into the following class of complaints: the undereducated will
often think that a design choice is arbitrary when a more educated person
will be able to see different consequences in the various alternatives.



.

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