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

From: -CELKO- <jcelko212_at_earthlink.net>
Date: Fri, 14 Dec 2007 12:30:04 -0800 (PST)
Message-ID: <7611de79-ad9c-4083-b5de-8ea306d74046@i12g2000prf.googlegroups.com> 





>> 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 :)
Received on Fri Dec 14 2007 - 14:30:04 CST












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