title: sql server daily average
body: <p>What's the best way to get a daily average.
  The data would have 2 values per day, for example:</p>
  
  <pre><code>Date             Value
  1/1/2012 4:00    10.00
  1/1/2012 16:00   11.00
  1/2/2012 4:00    11.22
  1/2/2012 16:00   13.55
  etc.
  </code></pre>