Books like Head First SQL by Lynn Beighley

A practical, 7th‑edition guide that teaches SQL from the ground up, covering design, security, data retrieval, and new SQL/XML 2008 features across Access, Oracle, SQL Server, and MySQL.

Sams Teach Yourself SQL in 10 Minutes—2nd Edition is a hands‑on tutorial that teaches SQL fundamentals and advanced techniques through bite‑size, 10‑minute lessons.

Explains Transact-SQL programming and highlights the differences between Microsoft and Sybase implementations.

PostgreSQL database servers have a common set of problems they encounter as their usage gets heavier and requirements more demanding. You could spend years discovering solutions to them all, step by step as you encounter them. Or you can just look in here. All successful database applications are destined to eventually run into issues scaling up their performance. Peek into the future of your PostgreSQL database's problems today. Know the warning signs to look for, and how to avoid the most common issues before they even happen. Surprisingly, most PostgreSQL database applications evolve in the same way: Choose the right hardware. Tune the operating system and server memory use. Optimize queries against the database, with the right indexes. Monitor every layer, from hardware to queries, using some tools that are inside PostgreSQL and others that are external. Using monitoring insight, continuously rework the design and configuration. On reaching the limits of a single server, break things up; connection pooling, caching, partitioning, and replication can all help handle increasing database workloads. The path to a high performance database system isn't always easy. But it doesn't have to be mysterious with the right guide. This book is a clear, step-by-step guide to optimizing and scaling up PostgreSQL database servers. - Publisher.

Updated for the latest database management systems, this introductory guide will get you up and running with SQL quickly. Whether you need to write database applications, perform administrative tasks, or generate reports, Learning SQL, Second Edition, will help you easily master all the SQL fundamentals. Each chapter presents a self-contained lesson on a key SQL concept or technique, with numerous illustrations, annotated examples, and exercises to let you practice the skills you learn.

Learn standard SQL with hands‑on examples, exercises, and solutions that keep you actively practicing the fundamentals, from beginner concepts to more advanced techniques.

A practical guide and reference to SQL, covering database models, syntax, and hands‑on tasks for beginners and seasoned users.