On page 176 , the derived-table-no-duplicates.sql code would not get the correct result if multiple product_id with the same latest date_reported value exist.
For example, product_id 2 has a bug_id 3456 and the latest reported_date is ‘2010-02-16’. But if product_id 3 has a bug_id 5999 with the same latest reported_date ‘2010-02-16’, then the query will get a wrong bug_id for product_id 2.