title: add column to mysql query plus give it value
body: <p>I am not sure how to do this but I have a query that has unions in it. and i want to be able to diff each one by added a column. How do I add this column and give it a value. Thanks!</p>
  
  <pre><code>Select ID,Name,SpecialColumn = 'Test'
  from table where ID = 'guid';
  </code></pre>