Reduce the number of identical inputs when user is filling out a field

themasterjamie

New Member
I have a zip table and a city table. Thereby a zip code can have only one city, but a city can have different zip codes. Now the user fills out zip code and city. In the table zip the field city is a foreign key to the table city. Different zip codes should point to only one city name. Here the user can make use of different spellings and I want to avoid that.These are the possibilities which come to my mind:Do you know any other possibilities?
 
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