SQL for Web Nerds
by Philip Greenspun
This is a free online SQL book by Philip Greenspun. It covers data modeling, simple queries, complex queries, transactions, triggers, views, style, PL/SQL and Java, trees, handling dates in Oracle, limits in Oracle, tuning, data warehousing, foreign and legacy data and normalization.
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by Markus Winand
SQL performance problems are everywhere, everyday. This book is a free SQL tuning e-book for developers. It avoids unnecessary details about database internals but highlights the one topic that is most often neglected: proper indexing.
by Krishna Rungta - guru99
SQL stands for Structured Query Language. It is the communication languages to talk to any database. This book is designed for beginners with little or no Database experience. Apart from teaching the SQL, it also covers the Database design process.
by Akeel I. Din - NCC Blackwell
Introductory text for learning SQL, it shows you how to use the language with crystal-clear explanations and examples. For more advanced and vendor-specific topics (triggers, stored procs, etc.) you'll need to look at the vendor's documentation.
Structured Query Language (SQL) is a widely-used query language for using database. This book provides a detailed description of SQL, its origins, its programming, and its uses. The book follows the specifications of the SQL:2008 ISO standard.