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From: "Josh Berkus" <josh@agliodbs.com>
Subject: IN, EXISTS or ANY?
To: pgsql-sql@postgresql.org
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Date: Sun, 28 Apr 2002 21:44:55 -0700
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Folks,

I was wondering if there is any difference in execution speed for the
following three statements:

WHERE case_id IN (SELECT case_id FROM case_clients
		     WHERE matter_no = '123.122342');
or:

WHERE case_id = ANY (SELECT case_id FROM case_clients
		     WHERE matter_no = '123.122342');
or

WHERE EXISTS ( SELECT case_id FROM case_clients
		     WHERE matter_no = '123.122342'
		     AND case_id = cases.case_id);

... or does the parser handle all three exactly the same way?

-Josh Berkus