title: How to get the average of a DATEDIFF()?
body: <p>I have the following query: </p>
  
  <pre><code>SELECT 
      DATEDIFF(day, DateUsed, DateExpires) AS DaysBetweenExpirationAndUse
  FROM tblOffer
  </code></pre>
  
  <p>How could i get the average number of days from the <code>DaysBetweenExpirationAndUse</code> column?</p>