Re: An small SQL problem

Hi Brad, Oooops. I think i better go and read your excelent book MySQL/PHP database applications agian...... Best regards, Davy Obdam mailto:info@davyobdam.com Brad Bulger wrote:

what database are you using? because the answer is different, depending. on postgres, for example, which supports subselects, you can do select * from TableA where FieldA1 not in (select FieldB2 from TableB) with mysql, there are no subselects, so you'd have to do something like select TableA.*, TableB.FieldB1 from TableA left join TableB on TableA.FieldA1 = TableB.FieldB1 having FieldB1 is null PS the one thing that for sure will not work is select TableA.* from TableA, TableB where TableA.FieldA1 != TableB.FieldB2 that will just give you a cartesian product, returning a copy of every row in TableA for every row in TableB that doesn't match its key On Sat, 12 Oct 2002, Christian Ista wrote:

Hello, I'm probably sleepy because I can't do a very easy query. :( I have 2 tables TableA(FieldA1, FieldA2, FieldA3) and TableB(FieldB1, FieldB2, FieldB3). I'd like to see the TableA records (FieldA2) where the FieldA1(Primary key) not exist in TableB(FieldB2). I tried "not exists" without success. Could you help me ? Christian, -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php