mirror of
https://github.com/postgres/postgres.git
synced 2025-11-03 09:13:20 +03:00
8436489c81
This extends GiST's support for nearest-neighbor searches to many of the standard data types. Teodor Sigaev
92 lines
1.8 KiB
Plaintext
92 lines
1.8 KiB
Plaintext
-- time check
|
|
CREATE TABLE timetmp (a time);
|
|
\copy timetmp from 'data/time.data'
|
|
SET enable_seqscan=on;
|
|
SELECT count(*) FROM timetmp WHERE a < '10:57:11';
|
|
count
|
|
-------
|
|
251
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM timetmp WHERE a <= '10:57:11';
|
|
count
|
|
-------
|
|
252
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM timetmp WHERE a = '10:57:11';
|
|
count
|
|
-------
|
|
1
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM timetmp WHERE a >= '10:57:11';
|
|
count
|
|
-------
|
|
293
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM timetmp WHERE a > '10:57:11';
|
|
count
|
|
-------
|
|
292
|
|
(1 row)
|
|
|
|
SELECT a, a <-> '10:57:11' FROM timetmp ORDER BY a <-> '10:57:11' LIMIT 3;
|
|
a | ?column?
|
|
----------+-----------------
|
|
10:57:11 | @ 0
|
|
10:57:10 | @ 1 sec
|
|
10:55:32 | @ 1 min 39 secs
|
|
(3 rows)
|
|
|
|
CREATE INDEX timeidx ON timetmp USING gist ( a );
|
|
SET enable_seqscan=off;
|
|
SELECT count(*) FROM timetmp WHERE a < '10:57:11'::time;
|
|
count
|
|
-------
|
|
251
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM timetmp WHERE a <= '10:57:11'::time;
|
|
count
|
|
-------
|
|
252
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM timetmp WHERE a = '10:57:11'::time;
|
|
count
|
|
-------
|
|
1
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM timetmp WHERE a >= '10:57:11'::time;
|
|
count
|
|
-------
|
|
293
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM timetmp WHERE a > '10:57:11'::time;
|
|
count
|
|
-------
|
|
292
|
|
(1 row)
|
|
|
|
EXPLAIN (COSTS OFF)
|
|
SELECT a, a <-> '10:57:11' FROM timetmp ORDER BY a <-> '10:57:11' LIMIT 3;
|
|
QUERY PLAN
|
|
--------------------------------------------------------------
|
|
Limit
|
|
-> Index Scan using timeidx on timetmp
|
|
Order By: (a <-> '10:57:11'::time without time zone)
|
|
(3 rows)
|
|
|
|
SELECT a, a <-> '10:57:11' FROM timetmp ORDER BY a <-> '10:57:11' LIMIT 3;
|
|
a | ?column?
|
|
----------+-----------------
|
|
10:57:11 | @ 0
|
|
10:57:10 | @ 1 sec
|
|
10:55:32 | @ 1 min 39 secs
|
|
(3 rows)
|
|
|