MySQL NOT IN Query not working

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Anyone want to point me to why this isn't working:

$hr_query = "select dp_lname,dp_fname,dp_id
			FROM dir_all
			WHERE dp_id NOT IN (SELECT sup_id FROM dir_title2)
			ORDER BY dp_lname";

There are two tables, dir_all (the main list of everyone) and dir_title2 (supplemental). If someone is in dir_title2 then the sup_id is the same as their dp_id. What I am trying to do is get a list of every person in dir_all that is NOT in dir_title2. Any thoughts as to what am doing wrong?

--
Kevin Murphy
Webmaster - Information and Marketing Services
Western Nevada Community College
www.wncc.edu
(775) 445-3326

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