title: Full join multiple queries
body: <p>I am trying to full join several queries, two will full join, the other won't. It gives error of </p>
  
  <blockquote>
    <p>invalid use of on clause</p>
  </blockquote>
  
  <p>Is there a comma or semicolon to be used when trying to full join queries?</p>
  
  <pre><code>select * from
  (query1) query1
  full join (query2) query2 
  on query1.x = query2.x;   does not join thereafter 
  full join (query3) query3 
  on query1.x = query3.x;
  </code></pre>