de to execute
     the command itself.  Similarly, if a <TT
CLASS="LITERAL"
>ddl_command_end</TT
> trigger
     fails with an error, the effects of the DDL statement will be rolled
     back, just as they would be in any other case where the containing
     transaction aborts.
   </P
><P
>     For a complete list of commands supported by the event trigger mechanism,
     see <A
HREF="event-trigger-matrix.html"
>Section 37.2</A
>.
   </P
><P
>     Event triggers are created using the command <A
HREF="sql-cre