title: How to combine multiple columns into one column?
body: <p>I'm writing a query and want the results in one column 
  My current results return like this</p>
  
  <pre><code>Column1     Column2    column3
  1              A         CAT
  </code></pre>
  
  <p>I want the results to return like this</p>
  
  <pre><code>Column1
  1
  A
  CAT
  </code></pre>