ieves that it will be more efficient to fetch
   rows from each table individually, or unless the table references involved
   are subject to different user mappings.  While sending the <code class="literal">JOIN</code>
   clauses, it takes the same precautions as mentioned above for the
   <code class="literal">WHERE</code> clauses.
  </p><p>
   The query that is actually sent to the remote server for execution can
   be examined using <code class="command">EXPLAIN VERBOSE</code>.
  </p></div><div class="s