Oracle 12c: SQL Casteel

Chapter 11

Advanced Challenge

JustLee Books has a problem: Book storage space is filling up. As a solution, management is considering limiting the inventory to only those books returning at least a 55% profit. Any book returning less than a 55% profit would be dropped from inventory and not reordered. This plan could, however, have a negative impact on overall sales. Management fears that if JustLee stops carrying the less profitable books, the company might lose repeat business from its customers. As part of the management's decision-making process, it wants to know whether current customers purchase less profitable books frequently. Therefore, management wants to know how many times these less profitable books have been purchased recently. Determine which books generate less than a 55% profit and how many copies of these books have been sold. Summarize your findings for management, and include a copy of the query used to retrieve data from the database tables.