Re: In an RDBMS, what does "Data" mean?

From: Anthony W. Youngman <>
Date: Mon, 14 Jun 2004 23:28:01 +0100
Message-ID: <>

In message <>, x <> writes
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>"Dawn M. Wolthuis" <> wrote in message
>> "Anthony W. Youngman" <> wrote in message
>> > LOOK at the subject of this thread again. It is an AXIOM of relational
>> > theory that data comes in tuples. Show me that that's true! And because
>> > it's an axiom, mathematics itself tells you that logic CAN not give you
>> > an answer!
>> Excellent, excellent, point. I would love to hear if there is any
>> disagreement on this point. If not, then perhaps we can work this into
>> glossary somehow related to "relational theory" or "axioms".
>> Cheers! --dawn
>Why do you keep saying "relational *THEORY*" ?

Because it IS a THEORY (see below).
>The title of Codd's 1970 ACM paper is "A Relational *MODEL* of Data for
>Large Shared Data Banks".
>The title of Codd's 1979 ACM paper is "Extending the Database Relational
>*MODEL* to Capture More Meaning".
>What meaning of *theory* do you have in mind ?

Not the mathematical meaning of "a proposition awaiting proof to become a theorem", but the scientific meaning of "a bunch of axioms and consequent theorems". Which happens to be the same meaning as "model".

I think, unfortunately, the use of the word "theory" is now common usage...


Anthony W. Youngman - wol at thewolery dot demon dot co dot uk
HEX wondered how much he should tell the Wizards. He felt it would not be a
good idea to burden them with too much input. Hex always thought of his reports
as Lies-to-People.
The Science of Discworld : (c) Terry Pratchett 1999
Received on Tue Jun 15 2004 - 00:28:01 CEST

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