title: SQL distances and radius highlight
body: <p>In my database I have a list of 1000 locations throughout the UK, in here I have the postcode, latitude and longitude just within three columns. I need to highlight any that are within a 2 mile circular radius of each other, but I am hitting a brick wall here. </p>
  
  <p>Is there some simple calculation I can run on the table to highlight those I need? Any help simple or complex would be really appreciated. </p>