Re: Newbie question about db normalization theory: redundant keys OK?

From: David Cressey <>
Date: Sat, 15 Dec 2007 11:22:40 GMT
Message-ID: <4OO8j.160$L91.153_at_trndny05>

"-CELKO-" <> wrote in message
> >> If teachers are permitted to change their names, then names are not
appropriate keys for teachers. <<
> Agreed; this was a skeleton table to demonstrate to the OP that tables
> can have redundant or even overlapping keys to preserve data
> integrity. Tony just gets easily side tracked and I am afraid I tend
> to fall for it myself. Sorry for the thread drift ..
> Instead of a teacher's name, we can tattoo a permanent bar code on the
> foreheads of the faculty, using their tax identification number :)

That sounds like something Hitler would have said! Received on Sat Dec 15 2007 - 12:22:40 CET

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