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Zip codes cross town boundaries all the time. 60195 serves parts of 3 different Chicagoland suburbs (Schaumburg, Hoffman Estates, and Palatine). 60504 crosses county boudaries. There are also zips that cross state boundaries. The 5-digit zip cannot accurately be used to determine state & town. It may be possible to get that level of granularity if you use the full 9-digit zip; I'm not sure. It seems from a normalization standpoint, the 5-digit zip is the redundant field. Try storing the address, city, and state and do a lookup for the right zip instead of the other way around. John A. Jones, CISSP Americas Information Security Officer Jones Lang LaSalle, Inc. V: +1-630-455-2787 F: +1-312-601-1782 john.jones@xxxxxxxxxx -----Original Message----- From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Steve Richter Sent: Wednesday, May 04, 2005 1:07 PM To: Midrange Systems Technical Discussion Subject: Re: Normalization was Left AS/400 and Returned On 5/4/05, Booth Martin <booth@xxxxxxxxxxxx> wrote: > This raises a question that has bothered me for some time: Why do we > store town and state anymore? Zip code does it all, doesn't it? you cant have two towns in the same zip code? -Steve -- This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list To post a message email: MIDRANGE-L@xxxxxxxxxxxx To subscribe, unsubscribe, or change list options, visit: http://lists.midrange.com/mailman/listinfo/midrange-l or email: MIDRANGE-L-request@xxxxxxxxxxxx Before posting, please take a moment to review the archives at http://archive.midrange.com/midrange-l. This email is for the use of the intended recipient(s) only. If you have received this email in error, please notify the sender immediately and then delete it. If you are not the intended recipient, you must not keep, use, disclose, copy or distribute this email without the author's prior permission. We have taken precautions to minimize the risk of transmitting software viruses, but we advise you to carry out your own virus checks on any attachment to this message. We cannot accept liability for any loss or damage caused by software viruses. The information contained in this communication may be confidential and may be subject to the attorney-client privilege. If you are the intended recipient and you do not wish to receive similar electronic messages from us in the future then please respond to the sender to this effect.
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