title: How to combine two sql queries into one
body: <p>How can I combine these two SQL statements?</p>
  
  <pre><code>SELECT SUM(hits01 + hits02 + hits03 + hits04 + hits05 + hits06 + hits07 + hits08 + hits09) AS 'AEROwiz'
  FROM tbl_2011
  WHERE appName='AEROwiz'
  
  SELECT SUM(hits10 + hits11 + hits12) AS 'AEROwiz'
  FROM tbl_2010
  WHERE appName='AEROwiz'
  </code></pre>
  
  <p>hits10, hits11 and hits12 exist in both tables.</p>