le column.  To create an unambiguous reference to a variable,
    declare it in a labeled block and use the block's label
    (see <A
HREF="plpgsql-structure.html"
>Section 40.2</A
>).  For example,
</P><PRE
CLASS="PROGRAMLISTING"
>&lt;&lt;block&gt;&gt;
DECLARE
    foo int;
BEGIN
    foo := ...;
    INSERT INTO dest (col) SELECT block.foo + bar FROM src;</PRE
><P>
    Here <TT
CLASS="LITERAL"
>block.foo</TT
> means the variable even if there is a column
    <TT
CLASS="LITERAL"
>foo</TT
> in <TT
CLASS="LITER