title: MySQL error: This type of clause previously parsed. (near SELECT)
body: <p>I am trying to copy values from one table to another when some condition is passed. But i got following error in doing so..</p>
  
  <blockquote>
    <p>This type of clause previously parsed. (near SELECT)</p>
  </blockquote>
  
  <pre><code>SELECT prefKey FROM master 
   WHERE id=[SELECT broaderid FROM broader WHERE id=[SELECT id FROM master]];
  </code></pre>