mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-12-21 08:29:39 +08:00
8436489c81
This extends GiST's support for nearest-neighbor searches to many of the standard data types. Teodor Sigaev
92 lines
1.7 KiB
Plaintext
92 lines
1.7 KiB
Plaintext
-- money check
|
|
CREATE TABLE moneytmp (a money) WITH OIDS;
|
|
\copy moneytmp from 'data/cash.data'
|
|
SET enable_seqscan=on;
|
|
SELECT count(*) FROM moneytmp WHERE a < '22649.64';
|
|
count
|
|
-------
|
|
289
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM moneytmp WHERE a <= '22649.64';
|
|
count
|
|
-------
|
|
290
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM moneytmp WHERE a = '22649.64';
|
|
count
|
|
-------
|
|
1
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM moneytmp WHERE a >= '22649.64';
|
|
count
|
|
-------
|
|
254
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM moneytmp WHERE a > '22649.64';
|
|
count
|
|
-------
|
|
253
|
|
(1 row)
|
|
|
|
SELECT a, a <-> '21472.79' FROM moneytmp ORDER BY a <-> '21472.79' LIMIT 3;
|
|
a | ?column?
|
|
------------+----------
|
|
$21,472.79 | $0.00
|
|
$21,469.25 | $3.54
|
|
$21,915.01 | $442.22
|
|
(3 rows)
|
|
|
|
CREATE INDEX moneyidx ON moneytmp USING gist ( a );
|
|
SET enable_seqscan=off;
|
|
SELECT count(*) FROM moneytmp WHERE a < '22649.64'::money;
|
|
count
|
|
-------
|
|
289
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM moneytmp WHERE a <= '22649.64'::money;
|
|
count
|
|
-------
|
|
290
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM moneytmp WHERE a = '22649.64'::money;
|
|
count
|
|
-------
|
|
1
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM moneytmp WHERE a >= '22649.64'::money;
|
|
count
|
|
-------
|
|
254
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM moneytmp WHERE a > '22649.64'::money;
|
|
count
|
|
-------
|
|
253
|
|
(1 row)
|
|
|
|
EXPLAIN (COSTS OFF)
|
|
SELECT a, a <-> '21472.79' FROM moneytmp ORDER BY a <-> '21472.79' LIMIT 3;
|
|
QUERY PLAN
|
|
-----------------------------------------------
|
|
Limit
|
|
-> Index Scan using moneyidx on moneytmp
|
|
Order By: (a <-> '$21,472.79'::money)
|
|
(3 rows)
|
|
|
|
SELECT a, a <-> '21472.79' FROM moneytmp ORDER BY a <-> '21472.79' LIMIT 3;
|
|
a | ?column?
|
|
------------+----------
|
|
$21,472.79 | $0.00
|
|
$21,469.25 | $3.54
|
|
$21,915.01 | $442.22
|
|
(3 rows)
|
|
|