title: SQL ordering sum two columns
body: <p>I need to sort the rows by sum or division two columns, like this:</p>
  <pre><code>SELECT `lastnick`, `Kills`, `Deaths`, `steamid` 
  FROM `players` 
  WHERE `lastlog` &gt;= UNIX_TIMESTAMP() - '1209600' 
  ORDER BY `players`.`Kills` / `players`.`Deaths` DESC 
  LIMIT 8
  </code></pre>
  <p>But this sql call is invalid. Is there any possibility?</p>
  <p>Here is an example I want sort players by their K/D stat, which they played at least once in the last 14 days.</p>