Relational_hierarchy_time.gif shows a crosstab of Sales SUM with two year rows, one for 1998 and one for 1999, and with four quarter columns, for Q1, Q2, Q3, and Q4. The Q1 column has Sales totals for Q1 1998 and Q1 1999. The Q2 column has Sales totals for Q2 1998 and Q2 1999. Q3 and Q4 columns follow in the same way.