using <TT
CLASS="COMMAND"
>RETURN QUERY</TT
> to output the result of
     evaluating a query.
    </P
><P
>     Finally, a <SPAN
CLASS="APPLICATION"
>PL/pgSQL</SPAN
> function can be declared to return
     <TT
CLASS="TYPE"
>void</TT
> if it has no useful return value.
    </P
><P
>     <SPAN
CLASS="APPLICATION"
>PL/pgSQL</SPAN
> functions can also be declared with output
     parameters in place of an explicit specification of the return type.
     This does not add any fundamental capability to the langu