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|
set enable_seqscan=off;
CREATE TABLE test_int2 (
i int2
);
INSERT INTO test_int2 VALUES (-2),(-1),(0),(1),(2),(3);
CREATE INDEX idx_int2 ON test_int2 USING rum (i);
SELECT * FROM test_int2 WHERE i<1::int2 ORDER BY i;
i
----
-2
-1
0
(3 rows)
SELECT * FROM test_int2 WHERE i<=1::int2 ORDER BY i;
i
----
-2
-1
0
1
(4 rows)
SELECT * FROM test_int2 WHERE i=1::int2 ORDER BY i;
i
---
1
(1 row)
SELECT * FROM test_int2 WHERE i>=1::int2 ORDER BY i;
i
---
1
2
3
(3 rows)
SELECT * FROM test_int2 WHERE i>1::int2 ORDER BY i;
i
---
2
3
(2 rows)
EXPLAIN (costs off)
SELECT *, i <=> 0::int2 FROM test_int2 ORDER BY i <=> 0::int2;
QUERY PLAN
----------------------------------------
Index Scan using idx_int2 on test_int2
Order By: (i <=> '0'::smallint)
(2 rows)
SELECT *, i <=> 0::int2 FROM test_int2 ORDER BY i <=> 0::int2;
i | ?column?
----+----------
0 | 0
-1 | 1
1 | 1
-2 | 2
2 | 2
3 | 3
(6 rows)
EXPLAIN (costs off)
SELECT *, i <=> 1::int2 FROM test_int2 WHERE i<1::int2 ORDER BY i <=> 1::int2;
QUERY PLAN
----------------------------------------
Index Scan using idx_int2 on test_int2
Index Cond: (i < '1'::smallint)
Order By: (i <=> '1'::smallint)
(3 rows)
SELECT *, i <=> 1::int2 FROM test_int2 WHERE i<1::int2 ORDER BY i <=> 1::int2;
i | ?column?
----+----------
0 | 1
-1 | 2
-2 | 3
(3 rows)
|
