On Wed, 1 Oct 2003 10:56:59 +0200 "Stefan Berger" <[EMAIL PROTECTED]> wrote:
> > I have 2 tables and i want to find difference (the id exists in one > table but in the other not) between them. > > With SELECT attachment_id from tbl_attachment, tbl_msg2atta where > attachment_id = atta_id > i receive all id wich are equals in both tables. > > I need to know which id is not present in the other table. SELECT attachment_id FROM tbl1 LEFT JOIN tbl2 ON tbl1.field = tbl2.field WHERE tbl2.field IS NULL; P.S. read about SELECT & LEFT JOIN in manual. --- WBR, Antony Dovgal aka tony2001 [EMAIL PROTECTED] -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
