contrib/btree_gist/sql/date.sql


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37

-- date check

CREATE TABLE datetmp (a date);

\copy datetmp from 'data/date.data'

SET enable_seqscan=on;

SELECT count(*) FROM datetmp WHERE a <  '2001-02-13';

SELECT count(*) FROM datetmp WHERE a <= '2001-02-13';

SELECT count(*) FROM datetmp WHERE a  = '2001-02-13';

SELECT count(*) FROM datetmp WHERE a >= '2001-02-13';

SELECT count(*) FROM datetmp WHERE a >  '2001-02-13';

SELECT a, a <-> '2001-02-13' FROM datetmp ORDER BY a <-> '2001-02-13' LIMIT 3;

CREATE INDEX dateidx ON datetmp USING gist ( a );

SET enable_seqscan=off;

SELECT count(*) FROM datetmp WHERE a <  '2001-02-13'::date;

SELECT count(*) FROM datetmp WHERE a <= '2001-02-13'::date;

SELECT count(*) FROM datetmp WHERE a  = '2001-02-13'::date;

SELECT count(*) FROM datetmp WHERE a >= '2001-02-13'::date;

SELECT count(*) FROM datetmp WHERE a >  '2001-02-13'::date;

EXPLAIN (COSTS OFF)
SELECT a, a <-> '2001-02-13' FROM datetmp ORDER BY a <-> '2001-02-13' LIMIT 3;
SELECT a, a <-> '2001-02-13' FROM datetmp ORDER BY a <-> '2001-02-13' LIMIT 3;