date.out

PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统

-- 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';
 count 
-------
   230
(1 row)

SELECT count(*) FROM datetmp WHERE a <= '2001-02-13';
 count 
-------
   231
(1 row)

SELECT count(*) FROM datetmp WHERE a  = '2001-02-13';
 count 
-------
     1
(1 row)

SELECT count(*) FROM datetmp WHERE a >= '2001-02-13';
 count 
-------
   314
(1 row)

SELECT count(*) FROM datetmp WHERE a >  '2001-02-13';
 count 
-------
   313
(1 row)

CREATE INDEX dateidx ON datetmp USING gist ( a );
SET enable_seqscan=off;
SELECT count(*) FROM datetmp WHERE a <  '2001-02-13'::date;
 count 
-------
   230
(1 row)

SELECT count(*) FROM datetmp WHERE a <= '2001-02-13'::date;
 count 
-------
   231
(1 row)

SELECT count(*) FROM datetmp WHERE a  = '2001-02-13'::date;
 count 
-------
     1
(1 row)

SELECT count(*) FROM datetmp WHERE a >= '2001-02-13'::date;
 count 
-------
   314
(1 row)

SELECT count(*) FROM datetmp WHERE a >  '2001-02-13'::date;
 count 
-------
   313
(1 row)