I have the following table mlist: +----------+---------+ | mlist_id | addr_id | +----------+---------+ | 1 | 1 | | 2 | 2 | | 2 | 3 | | 1 | 3 | +----------+---------+
This is the join table of my address book and my mailing lists. So person 1 is in list 1, person 2 is in list 2, and person 3 is in both lists. What I want to do is get a list of everyone that is NOT in a certain list. In other words, if I'm editing list 1, I need a list of all the people in the address book that aren't in list 1 (person 2). If I'm editing list 2, I want person 1. I never want to see person 3, because he is already in both lists. I'm currently trying to do this with a statement like "SELECT * FROM mlist GROUP BY addr_id HAVING mlist_id != 'list I'm currently editing'". The problem is that group by addr_id keeps the first row's value for mlist_id. So when I'm editing list 2, it works. But when I'm editing list 1, person 3 still shows up. If the last two rows were the other way around in the table, it would work for list 1 and not for list 2. So the question is, is there a command I can use to look through the aggregate set of mlist_id's, or is there another way to write this query? Thanks! ------------------------------- Adam Gintis Vanderbilt University --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
