title: Operand data type time is invalid for avg operator...?
body: <p>How can I avg(time(4)) in the following query:</p>
  
  <pre><code>  select top 10 avg(e.Duration) from TimeTable e
  </code></pre>
  
  <p>I'm getting the following error:</p>
  
  <blockquote>
    <p>Operand data type time is invalid for avg operator.</p>
  </blockquote>
  
  <p>Duration is type time(4) such as:</p>
  
  <pre><code>Duration
  -------------
  00:00:10.0000
  </code></pre>