Read ALL chapters in textbook
Except following optional material:

Sections 2.6.4, 2.6.5
Sections 5.3.6, 5.3.7, 5.3.8
Sections 5.4.2, 5.4.3, 5.4.4
Sections 6.8, 6.9, 6.10
Sections 7.6, 7.7
In Chapters 6, 7: material on duplicate elimination operator, grouping, aggregation operators
Section 9.8
Sections 10.4, 10.5, 10.6, 10.7