SQL Dialects Reference
Publisher: Wikibooks 2010
This wikibook is a compact comparative reference for several SQL language dialects. It lists particular common tasks and problems resolved in terms of several popular SQL server implementations. When possible, it tries to emphasize an universal solution. When it's not possible, it tries to list best practices.
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by Mark McIlroy - Blue Sky Technology
An introduction to the use of SQL to retrieve data and generate query result tables. The book covers SQL queries and is suitable for beginners and intermediate users. This includes an on-line environment where you can try out the examples.
by Rahul Batra - dreamincode.net
This is a short e-book teaching the basics of SQL assuming no prior knowledge of it. While the examples and text use Ingres as the database management system, the code should work correctly on any SQL compliant database.
by Philip Greenspun
Introduction to SQL: 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.
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.