The following are references for the databases mentioned in this chapter:
http://www.mysql.com This is the official website of the MySQL database server. Here you can find the latest versions as well as up-to-date information and online documentation for MySQL. You can also purchase support contracts here. You might want to look into this if you will be using MySQL in a corporate setting. (Many corporations balk at the idea of using software for which the company has no support contract in place.)
http://www.postgresql.org This is the official website of the PostgreSQL database server. You are asked to select a mirror when you arrive at this site. After you select a mirror, you are taken to the main site. From there, you can find information on the latest versions of PostgreSQL and read the online documentation.
http://www.postgresql.org/idocs/index.php?tutorial-start.html This interactive HTML documentation tree is a great place to get started with learning how to use PostgreSQL.
http://www.pgsql.com This is a commercial company that provides fee-based support contracts for the PostgreSQL database.
