A somewhat irrelevant but noticeable error can be found in Figures 6-25, 6-27 and 6-28 on the referenced pages. The total for calendar year 2004 in each figure shows the amount for the last sales region on the previous detail line rather than the actual total for that year.

While the reader is not directly instructed to execute it, the SQL query shown on page 146 under the section heading "Sorting the Query" is not correct unless a GROUP BY clause is added (ahead of the ORDER BY) because the sales amount is aggregated in the SELECT statement. Alternatively, the sum function could be removed.