SQL Essentials 
by Mark McIlroy

Publisher: Blue Sky Technology 2009
Number of pages: 34

Description:
SQL Essentials is an e-book that is an introduction to the use of SQL to retrieve data from databases and generate query result tables. The book covers SQL queries and is suitable for beginners and intermediate users. This includes an online environment where you can try out the examples from the book.

Download or read it online here: 
Read online