title: How do I determine the difference between values in database column and return the smallest difference?
body: <p>I've got a column of <code>DATETIME</code> values in MySQL and I'm looking to return the smallest difference between any two of those values in the column; I don't need to know what values the difference was between or when it was, just the difference between these two values alone.</p>
  
  <p>My table looks similar to this. </p>
  
  <pre><code>id    | launch_date_time
  ----------------------------
  1     | 2012-01-02 18:42:00
  2     | 2012-04-05 07:23:50
   ...
  x     | 2014-08-07 22:19:11
  </code></pre>
  
  <p>Would anyone be able to point me in the correct direction for constructing such a query?</p>