basic geographic structure

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От
Dario Borda
Тема
basic geographic structure
Дата
Msg-id
20060915182831.60841.qmail@web58402.mail.re3.yahoo.com
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basic geographic structure Dario Borda <gato_nemo@yahoo.com>
Re: basic geographic structure "Brandon Aiken" <BAiken@winemantech.com>
Hello

I need help with the data model of a basic geographic structure
Country > State/Region > Sub-Region

Most of the countries have a 3 level, so i want to do this
_________
Country
contry_id
...
_________
Region
region_id
country_id
....
__________
Sub-region
sub_region_id
region_id
_________
Client
client_id
sub_region_id

My Question:

Some countries do no have 3rd level (Sub-region) what is the best way to manage this when normaly my Client table needs to be linked to the 3er level data (sub_region_id)

Thank you, any tips will be appreciated

Dario





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