Sections 2.6.4, 2.6.5
Sections 5.3.3, 5.3.4, 5.3.5, 5.3.6
Sections 5.4.2, 5.4.3, 5.4.4
Sections 6.8.3, 6.9, 6.10.2, 6.10.3, 6.10.4
Sections 7.6, 7.7.2, 7.7.3, 7.7.4, 7.7.5, 7.7.6
In Chapters 6, 7: material on duplicate elimination operator, grouping,
aggregation operators
Section 8.5
Section 9.6, 9.8
Sections 10.4, 10.5, 10.6