title: join two tables when first table ends
body: <p>I have two tables like</p>
  
  <pre><code>tab 1 
  Date        Product
  29-05-2014  apple
  30-05-2014  banana
  31-05-2014  pink
  
  tab 2
  Date        Product
  29-05-2014  red
  30-05-2014  blue
  31-05-2014  orange
  01-06-2014  whit
  02-06-2014  black
  
  required table
  Date        Product
  29-05-2014  apple
  30-05-2014  banana
  31-05-2014  pink
  01-06-2014  whit
  02-06-2014  black
  </code></pre>
  
  <p>How do I join two tables when first table ends?</p>