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Using GROUP BY: SQL for MySQL Developers: A Comprehensive Tutorial and Reference - This excerpt from "SQL for MySQL Developers: A Comprehensive Tutorial and Reference" discusses adding aggregation functions to a select block with the use of a GROUP By clause.

PHP+MySQL tutorial - This tutorial is our minor attempt to repay the general Internet community for all of the free software such as Linux, MySQL, Perl and PHP that we use on a day to day basis. By adding our two cents worth to the global bookshelf of knowledge that is the World Wide Web, we hope to keep the ball rolling.

MySQL Basics - A Helpful MySQL Tutorial - This MySQL tutorial is a guide for new MySQL users, providing a reference of very basic, step by step, instructions on how to get started. This MySQL help page also gives more advanced users assistance in upgrading and running multiple versions of MySQL on a computer at the same time. MySQL is an SQL based relational database management system (DBMS) that runs under a broad array of operating systems. MySQL is frequently used by PHP and Perl scripts. The SQL commands discussed in this tutorial apply to MySQL operating under all operating systems. Only the installation instructions are Windows specific. The focus is on Windows XP Professional and Windows 2000 Professional machines.
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