abstime.sql

postgresql8.3.4源码,开源数据库

--
-- ABSTIME
-- testing built-in time type abstime
-- uses reltime and tinterval
--

--
-- timezones may vary based not only on location but the operating
-- system.  the main correctness issue is that the OS may not get 
-- daylight savings time right for times prior to Unix epoch (jan 1 1970).
--

CREATE TABLE ABSTIME_TBL (f1 abstime);

BEGIN;
INSERT INTO ABSTIME_TBL (f1) VALUES (abstime 'now');
INSERT INTO ABSTIME_TBL (f1) VALUES (abstime 'now');
SELECT count(*) AS two FROM ABSTIME_TBL WHERE f1 = 'now' ;
END;

DELETE FROM ABSTIME_TBL;

INSERT INTO ABSTIME_TBL (f1) VALUES ('Jan 14, 1973 03:14:21');
INSERT INTO ABSTIME_TBL (f1) VALUES (abstime 'Mon May  1 00:30:30 1995');
INSERT INTO ABSTIME_TBL (f1) VALUES (abstime 'epoch');
INSERT INTO ABSTIME_TBL (f1) VALUES (abstime 'infinity');
INSERT INTO ABSTIME_TBL (f1) VALUES (abstime '-infinity');
INSERT INTO ABSTIME_TBL (f1) VALUES (abstime 'May 10, 1947 23:59:12');

-- what happens if we specify slightly misformatted abstime? 
INSERT INTO ABSTIME_TBL (f1) VALUES ('Feb 35, 1946 10:00:00');
INSERT INTO ABSTIME_TBL (f1) VALUES ('Feb 28, 1984 25:08:10');

-- badly formatted abstimes:  these should result in invalid abstimes 
INSERT INTO ABSTIME_TBL (f1) VALUES ('bad date format');
INSERT INTO ABSTIME_TBL (f1) VALUES ('Jun 10, 1843');

-- test abstime operators

SELECT '' AS eight, * FROM ABSTIME_TBL;

SELECT '' AS six, * FROM ABSTIME_TBL
   WHERE ABSTIME_TBL.f1 < abstime 'Jun 30, 2001';

SELECT '' AS six, * FROM ABSTIME_TBL
   WHERE ABSTIME_TBL.f1 > abstime '-infinity';

SELECT '' AS six, * FROM ABSTIME_TBL
   WHERE abstime 'May 10, 1947 23:59:12' <> ABSTIME_TBL.f1;

SELECT '' AS three, * FROM ABSTIME_TBL
   WHERE abstime 'epoch' >= ABSTIME_TBL.f1;

SELECT '' AS four, * FROM ABSTIME_TBL
   WHERE ABSTIME_TBL.f1 <= abstime 'Jan 14, 1973 03:14:21';

SELECT '' AS four, * FROM ABSTIME_TBL
  WHERE ABSTIME_TBL.f1 <?>
	tinterval '["Apr 1 1950 00:00:00" "Dec 30 1999 23:00:00"]';

SELECT '' AS four, f1 AS abstime,
  date_part('year', f1) AS year, date_part('month', f1) AS month,
  date_part('day',f1) AS day, date_part('hour', f1) AS hour,
  date_part('minute', f1) AS minute, date_part('second', f1) AS second
  FROM ABSTIME_TBL
  WHERE isfinite(f1)
  ORDER BY abstime;