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MySQL:Once you've worked your way through the PHP Explained article, the next stage is learning MySQL and using database features in your site. Read MySQL Explained, a beginner's guide to MySQL. But only once you've read the PHP Explained document, okay?.
You'll need some good reference books beside you... I'm not kidding!
Here's a short list of some of the best PHP and MySQL reference books around.
...Or just get the book below; it will serve you well:
PHP and MySQL Web Development