Return-Path: owner-postman Received: from localhost.Berkeley.EDU (localhost.Berkeley.EDU [127.0.0.1]) by nobozo.CS.Berkeley.EDU (8.6.9/8.6.3) with SMTP id MAA11843 for postgres-redist; Fri, 20 Jan 1995 12:15:30 -0800 Resent-From: POSTGRES mailing list Resent-Message-Id: <199501202015.MAA11843@nobozo.CS.Berkeley.EDU> X-Authentication-Warning: nobozo.CS.Berkeley.EDU: Host localhost.Berkeley.EDU didn't use HELO protocol Sender: owner-postman@postgres.Berkeley.EDU X-Return-Path: owner-postman Received: from APSICC.APS.EDU (APSICC.APS.EDU [192.133.100.5]) by nobozo.CS.Berkeley.EDU (8.6.9/8.6.3) with SMTP id MAA11833 for ; Fri, 20 Jan 1995 12:15:28 -0800 Date: Fri, 20 Jan 1995 13:13:58 -0700 (MST) From: "E. Drew Einhorn" To: postgres@postgres.Berkeley.EDU CC: EINHORN_D@APSICC.APS.EDU Message-Id: <950120131358.5a59@APSICC.APS.EDU> Subject: Outer join equivalent?? Resent-To: postgres-redist@postgres.Berkeley.EDU Resent-Date: Fri, 20 Jan 95 12:15:29 -0800 Resent-XMts: smtp Hello, I've done quite a bit of work with SQL databases. So far I have only written a handful of postquel queries. Perhaps (I hope) am missing something that should be obvious. As I try to translate from the SQL I am fluent in, to the postquel I am just learning, I do not see how to express an outer join. I am trying to find the instances in class1 that do not have corresponding instances in class2. I normally use an outer join in SQL for this. Please enlighten this novice. Thank you, ============================================================================== To add/remove yourself to/from the POSTGRES mailing list: send mail with the subject line ADD or DEL to "postgres-request@postgres.Berkeley.EDU". If this fails, send mail to "post_questions@postgres.Berkeley.EDU" and a human will deal with it. DO NOT post to the "postgres" mailing list. ============================================================================== URL: http://s2k-ftp.CS.Berkeley.EDU:8000/postgres/