A good place to start learning SQL and if you want to go beyond the basics you would find their Advanced SQL Tutorial very useful. One nice MySql tutorial is also available on this site.
source: http://www.tizag.com/sqlTutorial/
A Gentle Introduction to SQL
A nice gentle introduction to SQL. This is very well written to help starters.
source: http://www.sqlzoo.net/
SQL Tutorial with reference and examples
A very good detailed SQL tutorial. Covers all important concepts divided in to three major sections: SQL Commands, Table Manipulation and SQL Syntax. Useful for all levels.
source: http://www.1keydata.com/sql/sql.html
Complete SQL
A very comprehensive SQL tutorial featuring almost all of the SQL language concepts and commands.
source: http://www.sql-tutorial.net/
MySQL Introduction
This is a very simple and easy to understand MySQL Introduction for the starters.
source: http://www.htmlite.com/MYSQLintro.php
A free SQL Course
This unique introductory SQL tutorial not only provides easy-to-understand SQL instructions, but it allows you to practice what you learn using the on-line SQL interpreter. You will receive immediate results after submitting your SQL commands.
source: http://www.sqlcourse.com/
MySQL Home
MySQL is an open source database. This is MySQL's official homepage with news, downloads, documentation, articles, tutorials and other resources. A gift for MySQL lovers.
source: http://www.mysql.com/
