abstime.out

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' ;
 two 
-----
   2
(1 row)

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');
ERROR:  date/time field value out of range: "Feb 35, 1946 10:00:00"
HINT:  Perhaps you need a different "datestyle" setting.
INSERT INTO ABSTIME_TBL (f1) VALUES ('Feb 28, 1984 25:08:10');
ERROR:  date/time field value out of range: "Feb 28, 1984 25:08:10"
-- badly formatted abstimes:  these should result in invalid abstimes 
INSERT INTO ABSTIME_TBL (f1) VALUES ('bad date format');
ERROR:  invalid input syntax for type abstime: "bad date format"
INSERT INTO ABSTIME_TBL (f1) VALUES ('Jun 10, 1843');
-- test abstime operators
SELECT '' AS eight, * FROM ABSTIME_TBL;
 eight |              f1              
-------+------------------------------
       | Sun Jan 14 03:14:21 1973 PST
       | Mon May 01 00:30:30 1995 PDT
       | Wed Dec 31 16:00:00 1969 PST
       | infinity
       | -infinity
       | Sat May 10 23:59:12 1947 PST
       | invalid
(7 rows)

SELECT '' AS six, * FROM ABSTIME_TBL
   WHERE ABSTIME_TBL.f1 < abstime 'Jun 30, 2001';
 six |              f1              
-----+------------------------------
     | Sun Jan 14 03:14:21 1973 PST
     | Mon May 01 00:30:30 1995 PDT
     | Wed Dec 31 16:00:00 1969 PST
     | -infinity
     | Sat May 10 23:59:12 1947 PST
(5 rows)

SELECT '' AS six, * FROM ABSTIME_TBL
   WHERE ABSTIME_TBL.f1 > abstime '-infinity';
 six |              f1              
-----+------------------------------
     | Sun Jan 14 03:14:21 1973 PST
     | Mon May 01 00:30:30 1995 PDT
     | Wed Dec 31 16:00:00 1969 PST
     | infinity
     | Sat May 10 23:59:12 1947 PST
     | invalid
(6 rows)

SELECT '' AS six, * FROM ABSTIME_TBL
   WHERE abstime 'May 10, 1947 23:59:12' <> ABSTIME_TBL.f1;
 six |              f1              
-----+------------------------------
     | Sun Jan 14 03:14:21 1973 PST
     | Mon May 01 00:30:30 1995 PDT
     | Wed Dec 31 16:00:00 1969 PST
     | infinity
     | -infinity
     | invalid
(6 rows)

SELECT '' AS three, * FROM ABSTIME_TBL
   WHERE abstime 'epoch' >= ABSTIME_TBL.f1;
 three |              f1              
-------+------------------------------
       | Wed Dec 31 16:00:00 1969 PST
       | -infinity
       | Sat May 10 23:59:12 1947 PST
(3 rows)

SELECT '' AS four, * FROM ABSTIME_TBL
   WHERE ABSTIME_TBL.f1 <= abstime 'Jan 14, 1973 03:14:21';
 four |              f1              
------+------------------------------
      | Sun Jan 14 03:14:21 1973 PST
      | Wed Dec 31 16:00:00 1969 PST
      | -infinity
      | Sat May 10 23:59:12 1947 PST
(4 rows)

SELECT '' AS four, * FROM ABSTIME_TBL
  WHERE ABSTIME_TBL.f1 <?>
	tinterval '["Apr 1 1950 00:00:00" "Dec 30 1999 23:00:00"]';
 four |              f1              
------+------------------------------
      | Sun Jan 14 03:14:21 1973 PST
      | Mon May 01 00:30:30 1995 PDT
      | Wed Dec 31 16:00:00 1969 PST
(3 rows)

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;
 four |           abstime            | year | month | day | hour | minute | second 
------+------------------------------+------+-------+-----+------+--------+--------
      | Sat May 10 23:59:12 1947 PST | 1947 |     5 |  10 |   23 |     59 |     12
      | Wed Dec 31 16:00:00 1969 PST | 1969 |    12 |  31 |   16 |      0 |      0
      | Sun Jan 14 03:14:21 1973 PST | 1973 |     1 |  14 |    3 |     14 |     21
      | Mon May 01 00:30:30 1995 PDT | 1995 |     5 |   1 |    0 |     30 |     30
(4 rows)