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Re: How to represent category, subcategory, product

From: paul c <toledobythesea_at_oohay.ac>
Date: Thu, 23 Nov 2006 13:28:11 GMT
Message-ID: <Llh9h.353422$5R2.110009@pd7urf3no>


JOG wrote:
...
> * kermit is a member of the set of frogs and of the set of amphibians.
...
> By normalizing to 3NF it becomes clear that you are actually dealing
> with two distinct predicate structures:
...
> * All frogs are amphibians.

...

I like your point that making up tables without first forming the predicates is jumping the gun but in this example I don't see how the frogs are necessarily a subset of the amphibians (ignoring outside information).

p Received on Thu Nov 23 2006 - 07:28:11 CST

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