http://wp.tutsplus.com/tutorials/creative-coding/writing-custom-queries-in-wordpress/

http://wp.tutsplus.com/tutorials/advanced-wordpress-queries-part-1/

http://wp.tutsplus.com/tutorials/advanced-wordpress-queries-part-2/

http://wp.tutsplus.com/tutorials/advanced-wordpress-queries-part-3/

http://wpengineer.com/1746/wordpress-database-functions/

http://codex.wordpress.org/Database_Description

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