mySQL select zipcodes within x km/miles within range of y

Question

Note: Although I use a zipcode database with Dutch zipcodes, this question is country independent.

I have a database with every zipcode in the Netherlands +

Answer 1

You want to do something like this:

SELECT zipcode FROM zipcodes WHERE DistanceFormula(lat, long, 4.808855, 52.406332) < $range

It may be slow if your table of zip codes is large. You may also want to check out the geospatial extensions for MySQL.