42 lines
1.7 KiB
Plaintext
42 lines
1.7 KiB
Plaintext
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SET enable_seqscan to false;
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-- test search for "not equals"
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CREATE TABLE test_ne (
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a TIMESTAMP,
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b NUMERIC
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);
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CREATE INDEX test_ne_idx ON test_ne USING gist (a, b);
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INSERT INTO test_ne SELECT '2009-01-01', 10.7 FROM generate_series(1,1000);
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INSERT INTO test_ne VALUES('2007-02-03', -91.3);
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INSERT INTO test_ne VALUES('2011-09-01', 43.7);
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INSERT INTO test_ne SELECT '2009-01-01', 10.7 FROM generate_series(1,1000);
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SET enable_indexscan to false;
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EXPLAIN (COSTS OFF) SELECT * FROM test_ne WHERE a <> '2009-01-01' AND b <> 10.7;
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QUERY PLAN
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------------------------------------------------------------------------------------------------------
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Bitmap Heap Scan on test_ne
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Recheck Cond: ((a <> 'Thu Jan 01 00:00:00 2009'::timestamp without time zone) AND (b <> 10.7))
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-> Bitmap Index Scan on test_ne_idx
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Index Cond: ((a <> 'Thu Jan 01 00:00:00 2009'::timestamp without time zone) AND (b <> 10.7))
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(4 rows)
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SELECT * FROM test_ne WHERE a <> '2009-01-01' AND b <> 10.7;
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a | b
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--------------------------+-------
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Sat Feb 03 00:00:00 2007 | -91.3
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Thu Sep 01 00:00:00 2011 | 43.7
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(2 rows)
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RESET enable_indexscan;
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-- test search for "not equals" using an exclusion constraint
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CREATE TABLE zoo (
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cage INTEGER,
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animal TEXT,
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EXCLUDE USING gist (cage WITH =, animal WITH <>)
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);
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INSERT INTO zoo VALUES(123, 'zebra');
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INSERT INTO zoo VALUES(123, 'zebra');
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INSERT INTO zoo VALUES(123, 'lion');
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ERROR: conflicting key value violates exclusion constraint "zoo_cage_animal_excl"
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DETAIL: Key (cage, animal)=(123, lion) conflicts with existing key (cage, animal)=(123, zebra).
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INSERT INTO zoo VALUES(124, 'lion');
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