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From: "Cimode" <cimode@hotmail.com>
Newsgroups: comp.databases.theory
Subject: Re: Discovering new relationships
Date: 3 Mar 2007 06:17:02 -0800
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On 3 mar, 01:14, paul c <toledobythe...@oohay.ac> wrote:
<<I don't think an RT
implementation can distinguish between a domain that stands for
measurements and one that stands for kinds of things such as rice>>
Agreed.

<< My attitude is that talking about kinds of data is verging on the
mystical
(if we are not talking about operators that apply to only certain
"kinds" of data). >>
While building a system once in data mining perspective, I designed a
database with the help of a team of statisticians.  They brought to my
attention the fundamental aspects of differences between discrete
variables and continuous variables and the differences in computing
treatment such differences imply.  In a fundamental design
perspective, this did not have any impact on the primary operators
used but rather helped me guide better the design process...Tere were
some moment I seriously wished some additional operators would exists:
what about an operator that would allow for instance to return the
product between cardinalities?  That would be useful in calculations?
I find that hardly *mystical*...So I have thought about a
classification of operators: some operators called primary (intersect,
union, etc...) that would be relevant mainly for relation level
operations and some I would call secondary that would be attribute
based such as.join

My two cents in exploring new territories...

My two cents