title: How can I count my users, and sum them as I go?
body: <p>I want to create chart that displays users growth over time, so can I in SQL count my users by Year, month and day and also sum up previous counts?</p>
  
  <pre><code>For instance:
  4/1/2013 - 1
  4/2/2013 - 2
  4/4/2013 - 1
  4/9/2013 - 4
  
  Want the result:
  4/1/2013 - 1
  4/2/2013 - 3
  4/4/2013 - 5
  4/9/2013 - 9
  </code></pre>