title: MySQL: Getting "busiest" or "most popular" hour from a datetime field?
body: <p>Consider the following table which has the fields - id (int) and date_created (datetime):</p>
  
  <pre><code>id       date_created
  
   1       2010-02-25 12:25:32
   2       2010-02-26 13:40:37
   3       2010-03-01 12:02:22
   4       2010-03-01 12:10:23
   5       2010-03-02 10:10:09
   6       2010-03-03 12:45:03
  </code></pre>
  
  <p>I want to know the busiest/most popular hour of the day for this set of data. In this example, the result I'm looking for would be 12.</p>
  
  <p>Ideas?</p>