SELECT IF(col1=3, (Select col2 from table2 where table2.id = 1), (Select col2 from table3 where table3.id = 1)) FROM table1 WHERE id=1;
That should do it. -----Original Message----- From: Thomas Lundström [mailto:[EMAIL PROTECTED] Sent: Wednesday, June 21, 2006 7:51 PM To: Song Ken Vern-E11804 Cc: mysql@lists.mysql.com Subject: Re: if else statement Not sure what you're aming for here and how your data is structured but why not use a join and alias and fetch all info in one select and then solve what you need in your code? Something in the line of: select t2.col2 from_t2, t3.col2 from_t3 from table1 t1, table2 t2, table3 t3 where t1.id = t2.id and t1.id = t3.id and t1.id = 3 Maybe you can do something like that? Regards, Thomas L. ons 2006-06-21 klockan 17:16 +0800 skrev Song Ken Vern-E11804: > Hi, > > I'm trying to build a query in using SQL instead of doing it in Perl. > > I am trying to do something like this : > > If ((select col1 from table1 where id = 1) == 3) > Then > Select col2 from table2 where table2.id = 1; > Else > Select col2 from table3 where table3.id = 1; > > In Perl I would probably do have to access the DB twice. > > Select col2 from table1 where if = 1; > > If (col2 == 3) { > Select col2 from table2 where table2.id = 1; > } else { > Select col2 from table3 where table3.id = 1; > } > > I've read the manual on subqueries but the example don't indicate how I > can > do a conditional test using a subquery? > > Am I on the right track or is there another way to do this? > > Thanks > > -- > Ken > e11804 > -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED] -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
