Re: Treating addresses in 3NF?
Date: 16 Nov 2002 18:40:19 -0800
Message-ID: <c0d87ec0.0211161840.68e5e66e_at_posting.google.com>
>> You mean to tell me that a prestigious, highly efficient
organisation like the British Royal Mail does not provide everyone
with a fully normalised relational model ... <<
For 'UK postcode databases', the Royal Mail holds the copyright and will licence you an 'outwards' database (i.e. the first segment of the full postcode) for about 150 UK pounds a year, or an 'inwards' database (i.e. the full 9- or 10-character postcode) for about 500 UK pounds per year.
The U.S. zipcodes are nested geographical areas of the form abbbcc-ddee. The first digit is a multi-state region, the next three are part of a state, the next two are postal districts within a city or county.
Sometimes a zipcode belongs to a single entity, like a hospital, government agency office, university, etc.
The stuff after the dash are trickier:
- The first two "zip+4" digits are the postal carrier route and the last two are neighborhoods within the route. The idea is to phsyical sort the mail for easy delivery.
- If the zipcode is a post office, the last four digits are all or part of a box number.
zip -> city
zip -> state
(zip, zip+4) ->> (street, city, state)
Received on Sun Nov 17 2002 - 03:40:19 CET