From: andrew <andrew.ylzhou@gmail.com>
To: pgsql-sql@postgresql.org
Subject: filtering after join
Date: Wed, 25 Jan 2006 18:27:33 +0100
Message-ID: <29d3b0b90601250927o2a5ee6e6mc33a7647da4438ce@mail.gmail.com> (raw)
I want to use a UDF to filter tuples t that are generated after a join.
More specifially, I have a UDF foo(record), which computes a value for
a given tuple. I can do the filtering before the join. e.g.:
select * from A, B where foo(A)<2 and A.a=B.b;
But I want to apply foo() to the tuples generated by the join
operation. How can I do that?
Thanks!
--
andrew
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To: pgsql-sql@postgresql.org
Cc: andrew.ylzhou@gmail.com
Subject: Re: filtering after join
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