title: sql table: sum up over intervals of 10 seconds
body: <p>I'm looking for a solution for my statistical problem:</p>
  
  <p>I have a table with one date column in it. Now what I want to do is count the number of rows in a certain time interval of 10 seconds:</p>
  
  <p>SELECT count(id), ... AS interval WHERE ... GROUP BY interval</p>
  
  <p>Anybody an idea how I can perform this?</p>
  
  <p>Thanks,
  Markus</p>