T"
>40.10.1. Variable Substitution</A
></H2
><P
>    SQL statements and expressions within a <SPAN
CLASS="APPLICATION"
>PL/pgSQL</SPAN
> function
    can refer to variables and parameters of the function.  Behind the scenes,
    <SPAN
CLASS="APPLICATION"
>PL/pgSQL</SPAN
> substitutes query parameters for such references.
    Parameters will only be substituted in places where a parameter or
    column reference is syntactically allowed.  As an extreme case, consider
    this example of poor programming styl