title: Calculate GrandTotal of all 12 months
body: <p>In rows I have one to twelve months.</p>
  
  <p>I have three columns: <code>Year</code>, <code>Month</code> and total number of enquiries.</p>
  
  <p>I want to add a row at the bottom to calculate the grand total of enquiries:</p>
  
  <pre><code>SELECT 
  YEAR(date) AS [Year],
  MONTH(date) AS [Month],
  COUNT(*) 
  from EnquiryMaster 
  Group By YEAR(date), MONTH(date)
  </code></pre>