For database systems courses in computer science, this book introduces the fundamental concepts necessary for designing, using, and implementing database systems and database applications. The presentation emphasizes the fundamentals of database modeling and design, the languages and models provided by database management systems, and database system implementation techniques. The book is intended as a textbook for a one- or two-semester course in database systems at the junior, senior, or graduate level, as well as a reference book. The goal is to provide an in-depth and up-to-date presentation of the most important aspects of database systems and applications, along with related technologies. It is assumed that readers are familiar with elementary programming and data-structuring concepts and have had some exposure to the basics of computer organization.