Hi Miguel, You'll need to use LEFT JOIN, that will show all records that match and a row in the second table will all values NULL where there is no match. Then you find all those rows that have no match in your WHERE clause.
Regards, Gavin Towey -----Original Message----- From: Miguel Vaz [mailto:pagong...@gmail.com] Sent: Tuesday, December 15, 2009 10:43 AM To: mysql@lists.mysql.com Subject: Count records in join Hi, I am stuck with a suposedly simple query: - i have two tables (: PROGS id_prog name EVENTS id id_prog name How can i list all records from PROGS with a sum of how many events each have? I want to find the progs that are empty. I remember something about using NULL, but i cant remember. :-P Thanks. MV This message contains confidential information and is intended only for the individual named. If you are not the named addressee, you are notified that reviewing, disseminating, disclosing, copying or distributing this e-mail is strictly prohibited. Please notify the sender immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. E-mail transmission cannot be guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or contain viruses. The sender therefore does not accept liability for any loss or damage caused by viruses or errors or omissions in the contents of this message, which arise as a result of e-mail transmission. [FriendFinder Networks, Inc., 220 Humbolt court, Sunnyvale, CA 94089, USA, FriendFinder.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=arch...@jab.org
