James F. Courtney and David B. Paradice's Database Systems for Management: "Chapter 6: The Relational Database Model"

Review pages 6-12 to 6-19 and study the examples. These pages discuss relational calculus, which utilizes mathematical set operations. Basic relational algebra set operations are discussed earlier in the chapter, on pages 6-1 to 6-12. Tables for the examples are included at the end of the chapter.