timestamp.out

PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统

-- timestamp check
CREATE TABLE timestamptmp (a timestamp);
\copy timestamptmp from 'data/timestamp.data'
SET enable_seqscan=on;
SELECT count(*) FROM timestamptmp WHERE a <  '2004-10-26 08:55:08';
 count 
-------
   278
(1 row)

SELECT count(*) FROM timestamptmp WHERE a <= '2004-10-26 08:55:08';
 count 
-------
   279
(1 row)

SELECT count(*) FROM timestamptmp WHERE a  = '2004-10-26 08:55:08';
 count 
-------
     1
(1 row)

SELECT count(*) FROM timestamptmp WHERE a >= '2004-10-26 08:55:08';
 count 
-------
   290
(1 row)

SELECT count(*) FROM timestamptmp WHERE a >  '2004-10-26 08:55:08';
 count 
-------
   289
(1 row)

CREATE INDEX timestampidx ON timestamptmp USING gist ( a );
SET enable_seqscan=off;
SELECT count(*) FROM timestamptmp WHERE a <  '2004-10-26 08:55:08'::timestamp;
 count 
-------
   278
(1 row)

SELECT count(*) FROM timestamptmp WHERE a <= '2004-10-26 08:55:08'::timestamp;
 count 
-------
   279
(1 row)

SELECT count(*) FROM timestamptmp WHERE a  = '2004-10-26 08:55:08'::timestamp;
 count 
-------
     1
(1 row)

SELECT count(*) FROM timestamptmp WHERE a >= '2004-10-26 08:55:08'::timestamp;
 count 
-------
   290
(1 row)

SELECT count(*) FROM timestamptmp WHERE a >  '2004-10-26 08:55:08'::timestamp;
 count 
-------
   289
(1 row)