7 booksDatabase Systems Title Author Difficulty Priority Database Internals Alex Petrov Advanced high Database Management Systems Raghu Ramakrishnan Intermediate high Database System Concepts Silberschatz, Korth & Sudarshan Intermediate high Grokking Relational Database Design Qiang Hao & Michael Tsikerdekis Beginner high Readings in Database Systems Bailis, Hellerstein & Stonebraker Advanced medium SQL: The Complete Reference Groff, Weinberg & Oppel Intermediate medium The Manga Guide to Databases Mana Takahashi & Shoko Azuma Beginner high