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From: E. Drew Einhorn <EINHORN_D@APSICC.APS.EDU>
To: postgres@postgres.Berkeley.EDU
Cc: EINHORN_D@APSICC.APS.EDU
Subject: Outer join equivalent??
Date: Fri, 20 Jan 1995 13:13:58 -0700 (MST)
Message-ID: <950120131358.5a59@APSICC.APS.EDU> (raw)

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,

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