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After authoring my first textbook, An Introduction to UNIX/Linux, I later wanted to author another textbook. I considered a follow-up to that same topic, but realized a different topic had a larger void and greater need: Database Security. The idea of authoring a textbook in the field of database security arose with the rising trends of data science the past few years, the plethora of digital information that is created and used each day, and the ongoing needs for information security. While there are a few good database security textbooks that exist, many of those were written 10 to 20 years ago, so I believed it was time for a fresh look at this important topic. Database security and information security may sound like similar concepts, but they are different in perspective and coverage. Database security does involve the information security principles of confidentiality, integrity, and availability. However, database security considers and implements those security measures or controls in more specific ways than are generally realized in the broader realm of information security. For example, to uphold the principle of confidentiality, we often turn to the information security control of encryption. But database security also involves other confidentiality approaches, such as techniques for account credential management, techniques to manage access to data, as well as techniques to manage the types of access. These are among the topics that we cover in Chapters 1, 3, 4, 5, 6, and 7.