title: TSQL- Finding the difference in days of multiple records in SQL Server
body: <p>Is it possible to find the difference of days of different records in SQL Server 2008 R2?</p>
  
  <pre><code>SELECT OrderDate FROM OrdersTbl WHERE SKU='AA0000' ORDER BY ORDERDATE DESC
  
  
  OrderDate
  -----------------------
  2009-12-03 00:00:00.000
  2009-04-03 00:00:00.000
  2008-02-22 00:00:00.000
  2008-02-21 00:00:00.000
  2007-02-18 00:00:00.000
  2007-01-27 00:00:00.000
  2006-10-13 00:00:00.000
  </code></pre>
  
  <p>I would like a way to get how many days in between there are for each order date so that I could find the average frequency. Thanks in advance.</p>