This book is truly fantastic!
I've not found any other SQL book which covers as much in such a clear and concise way as this one.
This takes you from the basics (it assumes absolutely no prior SQL experience!) right up to some seriously powerful queries in a concise and clear format - it really is superb.
If you have no prior SQL experience, this book takes you through developing your knowledge in stages and helps you to build up your confidence.
I now use this book as a syntax reference - it is so clearly and concisely written.
The examples and tutorials in the book are demonstrated using the Open Source MySQL database, which can be freely downloadable from mysql.com The syntax etc is mainly the same for other SQL database (eg, MS-SQL, Oracle, DB2 etc) - but the book does point out any differences where thay are important.
I really can't recommend this book enough!
It's far more than you would expect from an "in easy steps" book. You really are onto a winner here!