horology.sql

PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统

  OVERLAPS (timestamp with time zone '2000-11-27', interval '12 hours') AS "True";

SELECT (timestamp with time zone '2000-11-27', interval '12 hours')
  OVERLAPS (timestamp with time zone '2000-11-27 12:00', interval '12 hours') AS "False";

-- test without time zone
SELECT (timestamp without time zone '2000-11-27', timestamp without time zone '2000-11-28')
  OVERLAPS (timestamp without time zone '2000-11-27 12:00', timestamp without time zone '2000-11-30') AS "True";

SELECT (timestamp without time zone '2000-11-26', timestamp without time zone '2000-11-27')
  OVERLAPS (timestamp without time zone '2000-11-27 12:00', timestamp without time zone '2000-11-30') AS "False";

SELECT (timestamp without time zone '2000-11-27', timestamp without time zone '2000-11-28')
  OVERLAPS (timestamp without time zone '2000-11-27 12:00', interval '1 day') AS "True";

SELECT (timestamp without time zone '2000-11-27', interval '12 hours')
  OVERLAPS (timestamp without time zone '2000-11-27 12:00', timestamp without time zone '2000-11-30') AS "False";

SELECT (timestamp without time zone '2000-11-27', interval '12 hours')
  OVERLAPS (timestamp without time zone '2000-11-27', interval '12 hours') AS "True";

SELECT (timestamp without time zone '2000-11-27', interval '12 hours')
  OVERLAPS (timestamp without time zone '2000-11-27 12:00', interval '12 hours') AS "False";

-- test time and interval
SELECT (time '00:00', time '01:00')
  OVERLAPS (time '00:30', time '01:30') AS "True";

SELECT (time '00:00', interval '1 hour')
  OVERLAPS (time '00:30', interval '1 hour') AS "True";

SELECT (time '00:00', interval '1 hour')
  OVERLAPS (time '01:30', interval '1 hour') AS "False";

-- SQL99 seems to want this to be false (and we conform to the spec).
-- istm that this *should* return true, on the theory that time
-- intervals can wrap around the day boundary - thomas 2001-09-25
SELECT (time '00:00', interval '1 hour')
  OVERLAPS (time '01:30', interval '1 day') AS "False";

CREATE TABLE TEMP_TIMESTAMP (f1 timestamp with time zone);

-- get some candidate input values

INSERT INTO TEMP_TIMESTAMP (f1)
  SELECT d1 FROM TIMESTAMP_TBL
  WHERE d1 BETWEEN '13-jun-1957' AND '1-jan-1997'
   OR d1 BETWEEN '1-jan-1999' AND '1-jan-2010';

SELECT '' AS "16", f1 AS "timestamp"
  FROM TEMP_TIMESTAMP
  ORDER BY "timestamp";

SELECT '' AS "160", d.f1 AS "timestamp", t.f1 AS "interval", d.f1 + t.f1 AS plus
  FROM TEMP_TIMESTAMP d, INTERVAL_TBL t
  ORDER BY plus, "timestamp", "interval";

SELECT '' AS "160", d.f1 AS "timestamp", t.f1 AS "interval", d.f1 - t.f1 AS minus
  FROM TEMP_TIMESTAMP d, INTERVAL_TBL t
  WHERE isfinite(d.f1)
  ORDER BY minus, "timestamp", "interval";

SELECT '' AS "16", d.f1 AS "timestamp",
   timestamp with time zone '1980-01-06 00:00 GMT' AS gpstime_zero,
   d.f1 - timestamp with time zone '1980-01-06 00:00 GMT' AS difference
  FROM TEMP_TIMESTAMP d
  ORDER BY difference;

SELECT '' AS "226", d1.f1 AS timestamp1, d2.f1 AS timestamp2, d1.f1 - d2.f1 AS difference
  FROM TEMP_TIMESTAMP d1, TEMP_TIMESTAMP d2
  ORDER BY timestamp1, timestamp2, difference;

--
-- abstime, reltime arithmetic
--

SELECT '' AS ten, ABSTIME_TBL.f1 AS abstime, RELTIME_TBL.f1 AS reltime
    FROM ABSTIME_TBL, RELTIME_TBL
   WHERE (ABSTIME_TBL.f1 + RELTIME_TBL.f1) < abstime 'Jan 14 14:00:00 1971'
   ORDER BY abstime, reltime;

-- these four queries should return the same answer
-- the "infinity" and "-infinity" tuples in ABSTIME_TBL cannot be added and
-- therefore, should not show up in the results.

SELECT '' AS three, * FROM ABSTIME_TBL
  WHERE  (ABSTIME_TBL.f1 + reltime '@ 3 year')         -- +3 years
    < abstime 'Jan 14 14:00:00 1977';

SELECT '' AS three, * FROM ABSTIME_TBL
   WHERE  (ABSTIME_TBL.f1 + reltime '@ 3 year ago')    -- -3 years
     < abstime 'Jan 14 14:00:00 1971';

SELECT '' AS three, * FROM ABSTIME_TBL
   WHERE  (ABSTIME_TBL.f1 - reltime '@ 3 year')        -- -(+3) years
    < abstime 'Jan 14 14:00:00 1971';

SELECT '' AS three, * FROM ABSTIME_TBL
   WHERE  (ABSTIME_TBL.f1 - reltime '@ 3 year ago')    -- -(-3) years
     < abstime 'Jan 14 14:00:00 1977';

--
-- Conversions
--

SELECT '' AS "16", f1 AS "timestamp", date(f1) AS date
  FROM TEMP_TIMESTAMP
  WHERE f1 <> timestamp 'now'
  ORDER BY date, "timestamp";

SELECT '' AS "16", f1 AS "timestamp", abstime(f1) AS abstime
  FROM TEMP_TIMESTAMP
  ORDER BY abstime;

SELECT '' AS four, f1 AS abstime, date(f1) AS date
  FROM ABSTIME_TBL
  WHERE isfinite(f1) AND f1 <> abstime 'now'
  ORDER BY date, abstime;

SELECT '' AS two, d1 AS "timestamp", abstime(d1) AS abstime
  FROM TIMESTAMP_TBL WHERE NOT isfinite(d1);

SELECT '' AS three, f1 as abstime, cast(f1 as timestamp) AS "timestamp"
  FROM ABSTIME_TBL WHERE NOT isfinite(f1);

SELECT '' AS ten, f1 AS interval, reltime(f1) AS reltime
  FROM INTERVAL_TBL;

SELECT '' AS six, f1 as reltime, CAST(f1 AS interval) AS interval
  FROM RELTIME_TBL;

DROP TABLE TEMP_TIMESTAMP;

--
-- Formats
--

SET DateStyle TO 'US,Postgres';

SHOW DateStyle;

SELECT '' AS "64", d1 AS us_postgres FROM TIMESTAMP_TBL;

SELECT '' AS seven, f1 AS us_postgres FROM ABSTIME_TBL;

SET DateStyle TO 'US,ISO';

SELECT '' AS "64", d1 AS us_iso FROM TIMESTAMP_TBL;

SELECT '' AS seven, f1 AS us_iso FROM ABSTIME_TBL;

SET DateStyle TO 'US,SQL';

SHOW DateStyle;

SELECT '' AS "64", d1 AS us_sql FROM TIMESTAMP_TBL;

SELECT '' AS seven, f1 AS us_sql FROM ABSTIME_TBL;

SET DateStyle TO 'European,Postgres';

SHOW DateStyle;

INSERT INTO TIMESTAMP_TBL VALUES('13/06/1957');

SELECT count(*) as one FROM TIMESTAMP_TBL WHERE d1 = 'Jun 13 1957';

SELECT '' AS "65", d1 AS european_postgres FROM TIMESTAMP_TBL;

SELECT '' AS seven, f1 AS european_postgres FROM ABSTIME_TBL;

SET DateStyle TO 'European,ISO';

SHOW DateStyle;

SELECT '' AS "65", d1 AS european_iso FROM TIMESTAMP_TBL;

SELECT '' AS seven, f1 AS european_iso FROM ABSTIME_TBL;

SET DateStyle TO 'European,SQL';

SHOW DateStyle;

SELECT '' AS "65", d1 AS european_sql FROM TIMESTAMP_TBL;

SELECT '' AS seven, f1 AS european_sql FROM ABSTIME_TBL;

RESET DateStyle;