title: How to emulate ON DELETE CASCADE?
body: <p>Is there a way I can emulate the constraints <code>ON DELETE CASCADE</code> in Vertica ?
  I seem to get the following error :</p>
  
  <blockquote>
    <p>ROLLBACK 4229:  ON DELETE actions other than NO ACTION are not supported for foreign key constraints</p>
  </blockquote>
  
  <p>And I cannot find too much about it in the docs!</p>