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 > -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
