Re: Little design mistakes that can be easily avoided (2): Listenning to CELKO (and CELKO alikes)


"Gene Wirchenko" <genew@xxxxxxxx> wrote in message
news:cc0m53lkdf0os673kfdunubc46dkidq1uo@xxxxxxxxxx
Jon Heggland <jon.heggland@xxxxxxxxxxx> wrote:

[snip]

It is /always/ a superkey. It might be "candidate" (i.e. irreducible) as
well; if not, it is a /proper superkey/. (Also, a tuple is not a key,
but I'll quibble about that some other time:)

Why can't a tuple be a key? It does uniquely specify a tuple.


Because a tuple is a value and a key is a constraint.

Sincerely,

Gene Wirchenko

Computerese Irregular Verb Conjugation:
I have preferences.
You have biases.
He/She has prejudices.


.

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