 To use this
    function, you will need to specify the expected set of columns,
    as previously discussed for <CODE
CLASS="FUNCTION"
>dblink</CODE
>.
   </P
><P
>    For an async command (that is, a SQL statement not returning rows),
    the function returns a single row with a single text column containing
    the command's status string.  It is still necessary to specify that
    the result will have a single text column in the calling <TT
CLASS="LITERAL"
>FROM</TT
>
    clause.
   </P
></DIV
><DIV
CLA