Tutorial with SQL Interpreter & live practice database
not only provides easy-to-understand SQL instructions, but it allows you to practice what you learn using the on-line SQL interpreter
Introduction to Structured Query Language
A tutorial of the Structured Query Language (also known as SQL).
provided for people with no MySQL experience. It covers basics, such as connecting to the server, simple queries and databases
Oracle: SQL*Plus Tutorial
Some useful info for Linux SQL programmers.
SQL for Web Nerds
by Philip Greenspun: another SQL tutorial