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|
CREATE TABLE test_timestamp (
i timestamp
);
INSERT INTO test_timestamp VALUES
( '2004-10-26 03:55:08' ),
( '2004-10-26 04:55:08' ),
( '2004-10-26 05:55:08' ),
( '2004-10-26 08:55:08' ),
( '2004-10-26 09:55:08' ),
( '2004-10-26 10:55:08' )
;
SELECT i <=> '2004-10-26 06:24:08', i FROM test_timestamp ORDER BY 1, 2 ASC;
?column? | i
----------+--------------------------
1740 | Tue Oct 26 05:55:08 2004
5340 | Tue Oct 26 04:55:08 2004
8940 | Tue Oct 26 03:55:08 2004
9060 | Tue Oct 26 08:55:08 2004
12660 | Tue Oct 26 09:55:08 2004
16260 | Tue Oct 26 10:55:08 2004
(6 rows)
SELECT i <=| '2004-10-26 06:24:08', i FROM test_timestamp ORDER BY 1, 2 ASC;
?column? | i
----------+--------------------------
1740 | Tue Oct 26 05:55:08 2004
5340 | Tue Oct 26 04:55:08 2004
8940 | Tue Oct 26 03:55:08 2004
Infinity | Tue Oct 26 08:55:08 2004
Infinity | Tue Oct 26 09:55:08 2004
Infinity | Tue Oct 26 10:55:08 2004
(6 rows)
SELECT i |=> '2004-10-26 06:24:08', i FROM test_timestamp ORDER BY 1, 2 ASC;
?column? | i
----------+--------------------------
9060 | Tue Oct 26 08:55:08 2004
12660 | Tue Oct 26 09:55:08 2004
16260 | Tue Oct 26 10:55:08 2004
Infinity | Tue Oct 26 03:55:08 2004
Infinity | Tue Oct 26 04:55:08 2004
Infinity | Tue Oct 26 05:55:08 2004
(6 rows)
CREATE INDEX idx_timestamp ON test_timestamp USING rum (i);
set enable_seqscan=off;
explain (costs off)
SELECT * FROM test_timestamp WHERE i<'2004-10-26 08:55:08'::timestamp ORDER BY i;
QUERY PLAN
-----------------------------------------------------------------------------------
Sort
Sort Key: i
-> Index Scan using idx_timestamp on test_timestamp
Index Cond: (i < 'Tue Oct 26 08:55:08 2004'::timestamp without time zone)
(4 rows)
SELECT * FROM test_timestamp WHERE i<'2004-10-26 08:55:08'::timestamp ORDER BY i;
i
--------------------------
Tue Oct 26 03:55:08 2004
Tue Oct 26 04:55:08 2004
Tue Oct 26 05:55:08 2004
(3 rows)
explain (costs off)
SELECT * FROM test_timestamp WHERE i<='2004-10-26 08:55:08'::timestamp ORDER BY i;
QUERY PLAN
------------------------------------------------------------------------------------
Sort
Sort Key: i
-> Index Scan using idx_timestamp on test_timestamp
Index Cond: (i <= 'Tue Oct 26 08:55:08 2004'::timestamp without time zone)
(4 rows)
SELECT * FROM test_timestamp WHERE i<='2004-10-26 08:55:08'::timestamp ORDER BY i;
i
--------------------------
Tue Oct 26 03:55:08 2004
Tue Oct 26 04:55:08 2004
Tue Oct 26 05:55:08 2004
Tue Oct 26 08:55:08 2004
(4 rows)
explain (costs off)
SELECT * FROM test_timestamp WHERE i='2004-10-26 08:55:08'::timestamp ORDER BY i;
QUERY PLAN
-----------------------------------------------------------------------------
Index Scan using idx_timestamp on test_timestamp
Index Cond: (i = 'Tue Oct 26 08:55:08 2004'::timestamp without time zone)
(2 rows)
SELECT * FROM test_timestamp WHERE i='2004-10-26 08:55:08'::timestamp ORDER BY i;
i
--------------------------
Tue Oct 26 08:55:08 2004
(1 row)
explain (costs off)
SELECT * FROM test_timestamp WHERE i>='2004-10-26 08:55:08'::timestamp ORDER BY i;
QUERY PLAN
------------------------------------------------------------------------------------
Sort
Sort Key: i
-> Index Scan using idx_timestamp on test_timestamp
Index Cond: (i >= 'Tue Oct 26 08:55:08 2004'::timestamp without time zone)
(4 rows)
SELECT * FROM test_timestamp WHERE i>='2004-10-26 08:55:08'::timestamp ORDER BY i;
i
--------------------------
Tue Oct 26 08:55:08 2004
Tue Oct 26 09:55:08 2004
Tue Oct 26 10:55:08 2004
(3 rows)
explain (costs off)
SELECT * FROM test_timestamp WHERE i>'2004-10-26 08:55:08'::timestamp ORDER BY i;
QUERY PLAN
-----------------------------------------------------------------------------------
Sort
Sort Key: i
-> Index Scan using idx_timestamp on test_timestamp
Index Cond: (i > 'Tue Oct 26 08:55:08 2004'::timestamp without time zone)
(4 rows)
SELECT * FROM test_timestamp WHERE i>'2004-10-26 08:55:08'::timestamp ORDER BY i;
i
--------------------------
Tue Oct 26 09:55:08 2004
Tue Oct 26 10:55:08 2004
(2 rows)
explain (costs off)
SELECT *, i <=> '2004-10-26 08:55:08'::timestamp FROM test_timestamp
ORDER BY i <=> '2004-10-26 08:55:08'::timestamp;
QUERY PLAN
-----------------------------------------------------------------------------
Index Scan using idx_timestamp on test_timestamp
Order By: (i <=> 'Tue Oct 26 08:55:08 2004'::timestamp without time zone)
(2 rows)
SELECT *, i <=> '2004-10-26 08:55:08'::timestamp FROM test_timestamp
ORDER BY i <=> '2004-10-26 08:55:08'::timestamp;
i | ?column?
--------------------------+----------
Tue Oct 26 08:55:08 2004 | 0
Tue Oct 26 09:55:08 2004 | 3600
Tue Oct 26 10:55:08 2004 | 7200
Tue Oct 26 05:55:08 2004 | 10800
Tue Oct 26 04:55:08 2004 | 14400
Tue Oct 26 03:55:08 2004 | 18000
(6 rows)
explain (costs off)
SELECT *, i <=> '2004-10-26 05:00:00'::timestamp FROM test_timestamp
WHERE i>'2004-10-26 05:00:00'::timestamp ORDER BY i <=> '2004-10-26 05:00:00'::timestamp;
QUERY PLAN
-----------------------------------------------------------------------------
Index Scan using idx_timestamp on test_timestamp
Index Cond: (i > 'Tue Oct 26 05:00:00 2004'::timestamp without time zone)
Order By: (i <=> 'Tue Oct 26 05:00:00 2004'::timestamp without time zone)
(3 rows)
SELECT *, i <=> '2004-10-26 05:00:00'::timestamp FROM test_timestamp
WHERE i>'2004-10-26 05:00:00'::timestamp ORDER BY i <=> '2004-10-26 05:00:00'::timestamp;
i | ?column?
--------------------------+----------
Tue Oct 26 05:55:08 2004 | 3308
Tue Oct 26 08:55:08 2004 | 14108
Tue Oct 26 09:55:08 2004 | 17708
Tue Oct 26 10:55:08 2004 | 21308
(4 rows)
-- Tests for timestamptz
SELECT i::timestamptz AS i INTO test_timestamptz FROM test_timestamp;
CREATE INDEX idx_timestamptz ON test_timestamptz USING rum (i);
explain (costs off)
SELECT * FROM test_timestamptz WHERE i>'2004-10-26 08:55:08'::timestamptz ORDER BY i;
QUERY PLAN
------------------------------------------------------------------------------------
Sort
Sort Key: i
-> Index Scan using idx_timestamptz on test_timestamptz
Index Cond: (i > 'Tue Oct 26 08:55:08 2004 PDT'::timestamp with time zone)
(4 rows)
SELECT * FROM test_timestamptz WHERE i>'2004-10-26 08:55:08'::timestamptz ORDER BY i;
i
------------------------------
Tue Oct 26 09:55:08 2004 PDT
Tue Oct 26 10:55:08 2004 PDT
(2 rows)
explain (costs off)
SELECT *, i <=> '2004-10-26 08:55:08'::timestamptz FROM test_timestamptz
ORDER BY i <=> '2004-10-26 08:55:08'::timestamptz;
QUERY PLAN
------------------------------------------------------------------------------
Index Scan using idx_timestamptz on test_timestamptz
Order By: (i <=> 'Tue Oct 26 08:55:08 2004 PDT'::timestamp with time zone)
(2 rows)
SELECT *, i <=> '2004-10-26 08:55:08'::timestamptz FROM test_timestamptz
ORDER BY i <=> '2004-10-26 08:55:08'::timestamptz;
i | ?column?
------------------------------+----------
Tue Oct 26 08:55:08 2004 PDT | 0
Tue Oct 26 09:55:08 2004 PDT | 3600
Tue Oct 26 10:55:08 2004 PDT | 7200
Tue Oct 26 05:55:08 2004 PDT | 10800
Tue Oct 26 04:55:08 2004 PDT | 14400
Tue Oct 26 03:55:08 2004 PDT | 18000
(6 rows)
explain (costs off)
SELECT *, i <=> '2004-10-26 05:00:00'::timestamptz FROM test_timestamptz
WHERE i>'2004-10-26 05:00:00'::timestamptz ORDER BY i <=> '2004-10-26 05:00:00'::timestamptz;
QUERY PLAN
------------------------------------------------------------------------------
Index Scan using idx_timestamptz on test_timestamptz
Index Cond: (i > 'Tue Oct 26 05:00:00 2004 PDT'::timestamp with time zone)
Order By: (i <=> 'Tue Oct 26 05:00:00 2004 PDT'::timestamp with time zone)
(3 rows)
SELECT *, i <=> '2004-10-26 05:00:00'::timestamptz FROM test_timestamptz
WHERE i>'2004-10-26 05:00:00'::timestamptz ORDER BY i <=> '2004-10-26 05:00:00'::timestamptz;
i | ?column?
------------------------------+----------
Tue Oct 26 05:55:08 2004 PDT | 3308
Tue Oct 26 08:55:08 2004 PDT | 14108
Tue Oct 26 09:55:08 2004 PDT | 17708
Tue Oct 26 10:55:08 2004 PDT | 21308
(4 rows)
|
