Chapter 27: Formal Relational Query Languages (Last updated January 20, 2019)
Chapter 28: Advanced Relational Database Design (Last updated January 20, 2019)
Chapter 29: Object-Based Databases (Last updated January 20, 2019)
Chapter 30: XML (Last updated January 20, 2019)
Chapter 31: Information Retrieval (Last updated January 20, 2019)
Chapter 32: PostgreSQL (Last updated September 27, 2019)