Relational_hierarchy_inverted.gif shows a Sales SUM crosstab, with Quarter as the outer row labels and Year as the inner row labels. Outer labels are Q1, Q2, Q3, and Q4, and inner labels are 1998 and 1999. The Sales SUM column has Sales totals for all eight rows: Q1 1998, Q1 1999, Q2 1998, Q2 1999, and so on.