1. "MySQL Must Know" The original English title of this book is "Teach Yourself SQL in 10 Minutes", which is a very catchy title. It is the best introductory book on databases. It has long been ranked first in the database sales list on Amazon. It is recommended for novices who want to quickly understand database principles and MySQL. It is a fast food, concise and clear, small format, and very thin, which is easy to read. Some front-end engineers said that they only read this book on databases, which is enough to cope with most development tasks.

2. "SQL Learning Guide (2nd Edition Revised Edition)" If you just want to learn how to write SQL, you can read this book. O'Reilly animal book series, the quality is still very guaranteed.

3. "MySQL Technical Insider - InnoDB Storage Engine" How to say it, every industry has a few "street books" that are flipped over and over, and this book is the "street book" of MySQL. The book currently has three editions. From the perspective of source code, this book deeply analyzes the architecture, implementation principles, and working mechanism of InnoDB, and provides a large number of best practices, which can help you master InnoDB in a systematic and in-depth manner. The book focuses on practical application, and is supplemented by a large number of cases, making it highly operational.

4. "Redis Design and Implementation" Redis is currently the most widely used NoSQL database. This book systematically and comprehensively describes the internal operating mechanism of Redis, with rich diagrams, clear descriptions, and a large amount of reference information. It is a must-have for NoSQL database developers.