>>But as I stated before, E-R model diagram would be the same no matter
>>if logical DB implementation is hierarchical or relational. For that
>>reason I assume that ER modeling is more than just using symbols for
>>entity, attributes, relationships
>It is not.
>
What do you mean by "it is not"?
That E-R modeling is nothing more than just a bunch of symbols or that
the structure of E-R model does depend on whether underlying logical
structure is relational or hierarchical ( well isn't the whole point
of E-R model to be independent, at least for the most part, of
underlying logical structure ) ?
>>
>>But what is that "more" that makes E-R model truly independent of logical DB
>>implementation ?
>It is more vague and more imprecise. Being even more vague we could be
>even more independent, and saying nothing we achieve complete
>independence :-)
>
Are Bachman diagrams less vague than E-R diagrams?
Received on Tue Jul 24 2007 - 10:24:20 CDT
