From: Andreas Joseph Krogh <andreak@officenet.no>
To: pgsql-sql@postgresql.org
Subject: Alternative to INTERSECT
Date: Tue, 31 Jul 2007 17:30:51 +0000
Message-ID: <200707311730.51280.andreak@officenet.no> (raw)
Hi all. I have the following schema:
CREATE TABLE test (
id integer NOT NULL,
field character varying NOT NULL,
value character varying NOT NULL
);
ALTER TABLE ONLY test
ADD CONSTRAINT test_id_key UNIQUE (id, field, value);
CREATE INDEX test_like_idx ON test USING btree (id, field, value
varchar_pattern_ops);
Using INTERSECT I want to retrieve the rows matching (pseudo-code) "firstname
LIKE ('andrea%' OR 'jose%') AND lastname LIKE 'kro%'"
on=> SELECT t.id from test t WHERE t.field = 'firstname' AND t.value
LIKE 'andrea%'
INTERSECT SELECT t.id FROM test t WHERE t.field = 'firstname' AND t.value
LIKE 'jose%'
INTERSECT SELECT t.id FROM test t WHERE t.field = 'lastname' AND t.value
LIKE 'kro%';
id
----
1
(1 row)
Is there a way to make this more efficient with another construct, or
INTERSECT the only way to accomplish the desired result?
--
Andreas Joseph Krogh
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To: pgsql-sql@postgresql.org
Cc: andreak@officenet.no
Subject: Re: Alternative to INTERSECT
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