><LI
><P
>            The range tables contain entries for the tables <TT
CLASS="LITERAL"
>t1</TT
> and <TT
CLASS="LITERAL"
>t2</TT
>.
        </P
></LI
><LI
><P
>            The target lists contain one variable that points to column
            <TT
CLASS="LITERAL"
>b</TT
> of the range table entry for table <TT
CLASS="LITERAL"
>t2</TT
>.
        </P
></LI
><LI
><P
>            The qualification expressions compare the columns <TT
CLASS="LITERAL"
>a</TT
> of both
            range-table entries for equalit