title: Zipcodes & Distance
body: <p>I have a list of zipcoded in a MySQL Database together with their Latitude &amp; Longitude data (Column names: ZipCode, Lat, Lon).</p>
  
  <p>Now I have to make a search requests (search for the zipcode) to extract information from a website. When I make this search requests the results include all information within a radius of 50km of the zipcode.</p>
  
  <p>Now, I don't want to make an unnessary high amount of search requests, so I would like to minimize the amount of zipcodes. So I'm looking for a way to filter all zipcodes, so that I have only the zipcodes where the distance between them is >50km.</p>
  
  <p>Unfortunately I have no idea how to to it.
  Can someone help me to solve this?</p>