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|
-- timestamptz check
CREATE TABLE timestamptztmp (a timestamptz);
\copy timestamptztmp from 'data/timestamptz.data'
SET enable_seqscan=on;
SELECT count(*) FROM timestamptztmp WHERE a < '2018-12-18 10:59:54 GMT+3';
count
-------
391
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a <= '2018-12-18 10:59:54 GMT+3';
count
-------
392
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a = '2018-12-18 10:59:54 GMT+3';
count
-------
1
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a >= '2018-12-18 10:59:54 GMT+3';
count
-------
158
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a > '2018-12-18 10:59:54 GMT+3';
count
-------
157
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a < '2018-12-18 10:59:54 GMT+2';
count
-------
391
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a <= '2018-12-18 10:59:54 GMT+2';
count
-------
391
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a = '2018-12-18 10:59:54 GMT+2';
count
-------
0
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a >= '2018-12-18 10:59:54 GMT+2';
count
-------
158
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a > '2018-12-18 10:59:54 GMT+2';
count
-------
158
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a < '2018-12-18 10:59:54 GMT+4';
count
-------
392
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a <= '2018-12-18 10:59:54 GMT+4';
count
-------
392
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a = '2018-12-18 10:59:54 GMT+4';
count
-------
0
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a >= '2018-12-18 10:59:54 GMT+4';
count
-------
157
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a > '2018-12-18 10:59:54 GMT+4';
count
-------
157
(1 row)
SELECT a, a <-> '2018-12-18 10:59:54 GMT+2' FROM timestamptztmp ORDER BY a <-> '2018-12-18 10:59:54 GMT+2' LIMIT 3;
a | ?column?
------------------------------+-----------------------------------
Tue Dec 18 05:59:54 2018 PST | @ 1 hour
Thu Jan 10 03:01:34 2019 PST | @ 22 days 22 hours 1 min 40 secs
Thu Jan 24 12:28:12 2019 PST | @ 37 days 7 hours 28 mins 18 secs
(3 rows)
CREATE INDEX timestamptzidx ON timestamptztmp USING gist ( a );
SET enable_seqscan=off;
SELECT count(*) FROM timestamptztmp WHERE a < '2018-12-18 10:59:54 GMT+3'::timestamptz;
count
-------
391
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a <= '2018-12-18 10:59:54 GMT+3'::timestamptz;
count
-------
392
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a = '2018-12-18 10:59:54 GMT+3'::timestamptz;
count
-------
1
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a >= '2018-12-18 10:59:54 GMT+3'::timestamptz;
count
-------
158
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a > '2018-12-18 10:59:54 GMT+3'::timestamptz;
count
-------
157
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a < '2018-12-18 10:59:54 GMT+2'::timestamptz;
count
-------
391
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a <= '2018-12-18 10:59:54 GMT+2'::timestamptz;
count
-------
391
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a = '2018-12-18 10:59:54 GMT+2'::timestamptz;
count
-------
0
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a >= '2018-12-18 10:59:54 GMT+2'::timestamptz;
count
-------
158
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a > '2018-12-18 10:59:54 GMT+2'::timestamptz;
count
-------
158
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a < '2018-12-18 10:59:54 GMT+4'::timestamptz;
count
-------
392
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a <= '2018-12-18 10:59:54 GMT+4'::timestamptz;
count
-------
392
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a = '2018-12-18 10:59:54 GMT+4'::timestamptz;
count
-------
0
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a >= '2018-12-18 10:59:54 GMT+4'::timestamptz;
count
-------
157
(1 row)
SELECT count(*) FROM timestamptztmp WHERE a > '2018-12-18 10:59:54 GMT+4'::timestamptz;
count
-------
157
(1 row)
EXPLAIN (COSTS OFF)
SELECT a, a <-> '2018-12-18 10:59:54 GMT+2' FROM timestamptztmp ORDER BY a <-> '2018-12-18 10:59:54 GMT+2' LIMIT 3;
QUERY PLAN
------------------------------------------------------------------------------------
Limit
-> Index Only Scan using timestamptzidx on timestamptztmp
Order By: (a <-> 'Tue Dec 18 04:59:54 2018 PST'::timestamp with time zone)
(3 rows)
SELECT a, a <-> '2018-12-18 10:59:54 GMT+2' FROM timestamptztmp ORDER BY a <-> '2018-12-18 10:59:54 GMT+2' LIMIT 3;
a | ?column?
------------------------------+-----------------------------------
Tue Dec 18 05:59:54 2018 PST | @ 1 hour
Thu Jan 10 03:01:34 2019 PST | @ 22 days 22 hours 1 min 40 secs
Thu Jan 24 12:28:12 2019 PST | @ 37 days 7 hours 28 mins 18 secs
(3 rows)
|
