98 lines
2.3 KiB
Plaintext
98 lines
2.3 KiB
Plaintext
set enable_seqscan=off;
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CREATE TABLE test_name (
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i name
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);
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INSERT INTO test_name VALUES ('a'),('ab'),('abc'),('abb'),('axy'),('xyz');
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CREATE INDEX idx_name ON test_name USING gin (i);
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SELECT * FROM test_name WHERE i<'abc' ORDER BY i;
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i
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-----
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a
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ab
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abb
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(3 rows)
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SELECT * FROM test_name WHERE i<='abc' ORDER BY i;
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i
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-----
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a
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ab
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abb
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abc
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(4 rows)
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SELECT * FROM test_name WHERE i='abc' ORDER BY i;
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i
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-----
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abc
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(1 row)
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SELECT * FROM test_name WHERE i>='abc' ORDER BY i;
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i
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-----
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abc
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axy
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xyz
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(3 rows)
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SELECT * FROM test_name WHERE i>'abc' ORDER BY i;
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i
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-----
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axy
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xyz
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(2 rows)
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EXPLAIN (COSTS OFF) SELECT * FROM test_name WHERE i<'abc' ORDER BY i;
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QUERY PLAN
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---------------------------------------------
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Sort
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Sort Key: i
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-> Bitmap Heap Scan on test_name
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Recheck Cond: (i < 'abc'::name)
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-> Bitmap Index Scan on idx_name
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Index Cond: (i < 'abc'::name)
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(6 rows)
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EXPLAIN (COSTS OFF) SELECT * FROM test_name WHERE i<='abc' ORDER BY i;
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QUERY PLAN
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----------------------------------------------
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Sort
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Sort Key: i
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-> Bitmap Heap Scan on test_name
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Recheck Cond: (i <= 'abc'::name)
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-> Bitmap Index Scan on idx_name
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Index Cond: (i <= 'abc'::name)
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(6 rows)
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EXPLAIN (COSTS OFF) SELECT * FROM test_name WHERE i='abc' ORDER BY i;
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QUERY PLAN
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---------------------------------------
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Bitmap Heap Scan on test_name
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Recheck Cond: (i = 'abc'::name)
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-> Bitmap Index Scan on idx_name
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Index Cond: (i = 'abc'::name)
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(4 rows)
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EXPLAIN (COSTS OFF) SELECT * FROM test_name WHERE i>='abc' ORDER BY i;
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QUERY PLAN
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----------------------------------------------
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Sort
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Sort Key: i
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-> Bitmap Heap Scan on test_name
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Recheck Cond: (i >= 'abc'::name)
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-> Bitmap Index Scan on idx_name
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Index Cond: (i >= 'abc'::name)
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(6 rows)
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EXPLAIN (COSTS OFF) SELECT * FROM test_name WHERE i>'abc' ORDER BY i;
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QUERY PLAN
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---------------------------------------------
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Sort
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Sort Key: i
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-> Bitmap Heap Scan on test_name
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Recheck Cond: (i > 'abc'::name)
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-> Bitmap Index Scan on idx_name
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Index Cond: (i > 'abc'::name)
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(6 rows)
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