ed with <SPAN
CLASS="APPLICATION"
>PL/pgSQL</SPAN
> can be
    used anywhere that built-in functions could be used.
    For example, it is possible to
    create complex conditional computation functions and later use
    them to define operators or use them in index expressions.
   </P
><P
>    In <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> 9.0 and later,
    <SPAN
CLASS="APPLICATION"
>PL/pgSQL</SPAN
> is installed by default.
    However it is still a loadable module, so especially security-conscious
  