       The command tag associated with the event for which the event trigger
        is run, for example <code class="literal">"CREATE FUNCTION"</code>.
       </p></dd></dl></div><p>
   </p><p>
    An event trigger function must return a <code class="symbol">NULL</code> pointer
    (<span class="emphasis"><em>not</em></span> an SQL null value, that is, do not
    set <em class="parameter"><code>isNull</code></em> true).
   </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation foote