Re: Pizza Example
Date: Fri, 23 Apr 2004 18:13:51 GMT
"Anthony W. Youngman" <wol_at_thewolery.demon.co.uk> wrote in message
> I've actually managed to work out a formal statement of what I always
> "Normalisation by non-loss decomposition" is impossible. The law of
> entropy says so.
> So, to rephrase your last sentence, "By extracting the data from the
> real world and storing it in ANY database you are changing it in some
> sense, and losing data IS INEVITABLE."
This is true.
This is not. Or at least, you also gain. And I'd distinguish potential information ("raw data"?) from information structures. I don't prefer to have my system encode every bit of verbiage spouted by a potential user in requirements-gathering.
> And the more you decompose
> it, the closer you get to the point where "cause and effect" ceases to
> have meaning :-) (which means it gets more and more likely, that an
> attempt to get back to where you started will leave you somewhere else
> entirely :-)
That assumes you need to get back to where you started, which isn't a goal I
necessarily have in mind. If I do, it's called a text document. My goal is
not to reassemble a paper purchase order from data in a database - I usually
need to present different views of the data, and do something interesting
other than regurgitating it to the user verbatim.