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Re: 4NF is Where It Is At! [WAS Re: 1:1 relationships]

From: David Cressey <david_at_dcressey.com>
Date: Tue, 13 Feb 2001 12:44:49 GMT
Message-ID: <5%9i6.35386$2X4.107697_at_petpeeve.ziplink.net> 







Hmm...




how about the following situation, as defined by the (hypothetical) phone
company:



"You can take your phone number with you when you move, if and only if your
new address is served by the same CO  (Central Office?) as the old address
was served by.



If, however, your new address is served by a different CO, then you may not
take your phone number with you."



Now what are the implications for dependency,  and the corresponding
implications for normalization?





--
Regards,
    David Cressey
    www.dcressey.com


Received on Tue Feb 13 2001 - 13:44:49 CET












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