Chapter 9 Databases Goes over the history of MySQL, PostgreSQL, Oracle, and Microsoft SQL Server and SQLite. Most of the other parts of theat section cover mostly MySQL. I do notice that you saw it, it does have quite a bit in it so just overlooking Chapter 9 without seeing what was contained there doesn't mean it isn't.
It covers just about all you would need to get a start with MySQL and PHP, including normalisation, MySQL Improved (MySQLI), and more. I like it because there are no torn or missing pages or coffee stains all over the pages like many of my books,some held together with masking tape.