Re: what are keys and surrogates?

From: David Cressey <>
Date: Sun, 13 Jan 2008 21:41:50 GMT
Message-ID: <yAvij.2062$rV6.121_at_trndny06>

"David BL" <> wrote in message

> This however doesn't change the fact that most authors define a
> (mathematical) relation as a set of ordered tuples, which means a
> function is not a relation (assuming, as most do, that a function has
> a defined domain and codomain).

I don't understand how the conclusion follow from the premise. Received on Sun Jan 13 2008 - 22:41:50 CET

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