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Historically, extract() just returned zero for any case involving an infinite timestamp[tz] input; even cases in which the unit name was invalid. This is not very sensible. Instead, return infinity or -infinity as appropriate when the requested field is one that is monotonically increasing (e.g, year, epoch), or NULL when it is not (e.g., day, hour). Also, throw the expected errors for bad unit names. BACKWARDS INCOMPATIBLE CHANGE Vitaly Burovoy, reviewed by Vik Fearing
343 lines
11 KiB
SQL
343 lines
11 KiB
SQL
--
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-- DATE
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--
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CREATE TABLE DATE_TBL (f1 date);
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INSERT INTO DATE_TBL VALUES ('1957-04-09');
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INSERT INTO DATE_TBL VALUES ('1957-06-13');
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INSERT INTO DATE_TBL VALUES ('1996-02-28');
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INSERT INTO DATE_TBL VALUES ('1996-02-29');
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INSERT INTO DATE_TBL VALUES ('1996-03-01');
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INSERT INTO DATE_TBL VALUES ('1996-03-02');
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INSERT INTO DATE_TBL VALUES ('1997-02-28');
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INSERT INTO DATE_TBL VALUES ('1997-02-29');
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INSERT INTO DATE_TBL VALUES ('1997-03-01');
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INSERT INTO DATE_TBL VALUES ('1997-03-02');
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INSERT INTO DATE_TBL VALUES ('2000-04-01');
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INSERT INTO DATE_TBL VALUES ('2000-04-02');
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INSERT INTO DATE_TBL VALUES ('2000-04-03');
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INSERT INTO DATE_TBL VALUES ('2038-04-08');
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INSERT INTO DATE_TBL VALUES ('2039-04-09');
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INSERT INTO DATE_TBL VALUES ('2040-04-10');
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SELECT f1 AS "Fifteen" FROM DATE_TBL;
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SELECT f1 AS "Nine" FROM DATE_TBL WHERE f1 < '2000-01-01';
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SELECT f1 AS "Three" FROM DATE_TBL
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WHERE f1 BETWEEN '2000-01-01' AND '2001-01-01';
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--
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-- Check all the documented input formats
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--
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SET datestyle TO iso; -- display results in ISO
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SET datestyle TO ymd;
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SELECT date 'January 8, 1999';
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SELECT date '1999-01-08';
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SELECT date '1999-01-18';
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SELECT date '1/8/1999';
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SELECT date '1/18/1999';
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SELECT date '18/1/1999';
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SELECT date '01/02/03';
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SELECT date '19990108';
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SELECT date '990108';
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SELECT date '1999.008';
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SELECT date 'J2451187';
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SELECT date 'January 8, 99 BC';
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SELECT date '99-Jan-08';
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SELECT date '1999-Jan-08';
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SELECT date '08-Jan-99';
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SELECT date '08-Jan-1999';
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SELECT date 'Jan-08-99';
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SELECT date 'Jan-08-1999';
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SELECT date '99-08-Jan';
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SELECT date '1999-08-Jan';
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SELECT date '99 Jan 08';
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SELECT date '1999 Jan 08';
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SELECT date '08 Jan 99';
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SELECT date '08 Jan 1999';
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SELECT date 'Jan 08 99';
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SELECT date 'Jan 08 1999';
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SELECT date '99 08 Jan';
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SELECT date '1999 08 Jan';
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SELECT date '99-01-08';
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SELECT date '1999-01-08';
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SELECT date '08-01-99';
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SELECT date '08-01-1999';
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SELECT date '01-08-99';
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SELECT date '01-08-1999';
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SELECT date '99-08-01';
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SELECT date '1999-08-01';
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SELECT date '99 01 08';
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SELECT date '1999 01 08';
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SELECT date '08 01 99';
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SELECT date '08 01 1999';
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SELECT date '01 08 99';
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SELECT date '01 08 1999';
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SELECT date '99 08 01';
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SELECT date '1999 08 01';
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SET datestyle TO dmy;
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SELECT date 'January 8, 1999';
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SELECT date '1999-01-08';
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SELECT date '1999-01-18';
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SELECT date '1/8/1999';
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SELECT date '1/18/1999';
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SELECT date '18/1/1999';
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SELECT date '01/02/03';
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SELECT date '19990108';
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SELECT date '990108';
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SELECT date '1999.008';
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SELECT date 'J2451187';
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SELECT date 'January 8, 99 BC';
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SELECT date '99-Jan-08';
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SELECT date '1999-Jan-08';
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SELECT date '08-Jan-99';
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SELECT date '08-Jan-1999';
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SELECT date 'Jan-08-99';
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SELECT date 'Jan-08-1999';
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SELECT date '99-08-Jan';
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SELECT date '1999-08-Jan';
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SELECT date '99 Jan 08';
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SELECT date '1999 Jan 08';
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SELECT date '08 Jan 99';
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SELECT date '08 Jan 1999';
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SELECT date 'Jan 08 99';
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SELECT date 'Jan 08 1999';
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SELECT date '99 08 Jan';
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SELECT date '1999 08 Jan';
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SELECT date '99-01-08';
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SELECT date '1999-01-08';
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SELECT date '08-01-99';
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SELECT date '08-01-1999';
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SELECT date '01-08-99';
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SELECT date '01-08-1999';
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SELECT date '99-08-01';
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SELECT date '1999-08-01';
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SELECT date '99 01 08';
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SELECT date '1999 01 08';
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SELECT date '08 01 99';
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SELECT date '08 01 1999';
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SELECT date '01 08 99';
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SELECT date '01 08 1999';
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SELECT date '99 08 01';
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SELECT date '1999 08 01';
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SET datestyle TO mdy;
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SELECT date 'January 8, 1999';
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SELECT date '1999-01-08';
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SELECT date '1999-01-18';
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SELECT date '1/8/1999';
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SELECT date '1/18/1999';
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SELECT date '18/1/1999';
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SELECT date '01/02/03';
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SELECT date '19990108';
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SELECT date '990108';
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SELECT date '1999.008';
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SELECT date 'J2451187';
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SELECT date 'January 8, 99 BC';
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SELECT date '99-Jan-08';
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SELECT date '1999-Jan-08';
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SELECT date '08-Jan-99';
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SELECT date '08-Jan-1999';
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SELECT date 'Jan-08-99';
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SELECT date 'Jan-08-1999';
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SELECT date '99-08-Jan';
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SELECT date '1999-08-Jan';
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SELECT date '99 Jan 08';
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SELECT date '1999 Jan 08';
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SELECT date '08 Jan 99';
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SELECT date '08 Jan 1999';
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SELECT date 'Jan 08 99';
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SELECT date 'Jan 08 1999';
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SELECT date '99 08 Jan';
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SELECT date '1999 08 Jan';
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SELECT date '99-01-08';
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SELECT date '1999-01-08';
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SELECT date '08-01-99';
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SELECT date '08-01-1999';
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SELECT date '01-08-99';
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SELECT date '01-08-1999';
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SELECT date '99-08-01';
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SELECT date '1999-08-01';
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SELECT date '99 01 08';
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SELECT date '1999 01 08';
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SELECT date '08 01 99';
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SELECT date '08 01 1999';
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SELECT date '01 08 99';
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SELECT date '01 08 1999';
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SELECT date '99 08 01';
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SELECT date '1999 08 01';
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RESET datestyle;
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--
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-- Simple math
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-- Leave most of it for the horology tests
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--
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SELECT f1 - date '2000-01-01' AS "Days From 2K" FROM DATE_TBL;
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SELECT f1 - date 'epoch' AS "Days From Epoch" FROM DATE_TBL;
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SELECT date 'yesterday' - date 'today' AS "One day";
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SELECT date 'today' - date 'tomorrow' AS "One day";
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SELECT date 'yesterday' - date 'tomorrow' AS "Two days";
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SELECT date 'tomorrow' - date 'today' AS "One day";
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SELECT date 'today' - date 'yesterday' AS "One day";
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SELECT date 'tomorrow' - date 'yesterday' AS "Two days";
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--
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-- test extract!
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--
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-- epoch
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--
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SELECT EXTRACT(EPOCH FROM DATE '1970-01-01'); -- 0
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SELECT EXTRACT(EPOCH FROM TIMESTAMP '1970-01-01'); -- 0
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SELECT EXTRACT(EPOCH FROM TIMESTAMPTZ '1970-01-01+00'); -- 0
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--
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-- century
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--
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SELECT EXTRACT(CENTURY FROM DATE '0101-12-31 BC'); -- -2
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SELECT EXTRACT(CENTURY FROM DATE '0100-12-31 BC'); -- -1
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SELECT EXTRACT(CENTURY FROM DATE '0001-12-31 BC'); -- -1
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SELECT EXTRACT(CENTURY FROM DATE '0001-01-01'); -- 1
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SELECT EXTRACT(CENTURY FROM DATE '0001-01-01 AD'); -- 1
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SELECT EXTRACT(CENTURY FROM DATE '1900-12-31'); -- 19
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SELECT EXTRACT(CENTURY FROM DATE '1901-01-01'); -- 20
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SELECT EXTRACT(CENTURY FROM DATE '2000-12-31'); -- 20
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SELECT EXTRACT(CENTURY FROM DATE '2001-01-01'); -- 21
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SELECT EXTRACT(CENTURY FROM CURRENT_DATE)>=21 AS True; -- true
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--
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-- millennium
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--
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SELECT EXTRACT(MILLENNIUM FROM DATE '0001-12-31 BC'); -- -1
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SELECT EXTRACT(MILLENNIUM FROM DATE '0001-01-01 AD'); -- 1
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SELECT EXTRACT(MILLENNIUM FROM DATE '1000-12-31'); -- 1
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SELECT EXTRACT(MILLENNIUM FROM DATE '1001-01-01'); -- 2
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SELECT EXTRACT(MILLENNIUM FROM DATE '2000-12-31'); -- 2
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SELECT EXTRACT(MILLENNIUM FROM DATE '2001-01-01'); -- 3
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-- next test to be fixed on the turn of the next millennium;-)
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SELECT EXTRACT(MILLENNIUM FROM CURRENT_DATE); -- 3
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--
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-- decade
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--
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SELECT EXTRACT(DECADE FROM DATE '1994-12-25'); -- 199
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SELECT EXTRACT(DECADE FROM DATE '0010-01-01'); -- 1
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SELECT EXTRACT(DECADE FROM DATE '0009-12-31'); -- 0
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SELECT EXTRACT(DECADE FROM DATE '0001-01-01 BC'); -- 0
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SELECT EXTRACT(DECADE FROM DATE '0002-12-31 BC'); -- -1
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SELECT EXTRACT(DECADE FROM DATE '0011-01-01 BC'); -- -1
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SELECT EXTRACT(DECADE FROM DATE '0012-12-31 BC'); -- -2
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--
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-- some other types:
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--
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-- on a timestamp.
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SELECT EXTRACT(CENTURY FROM NOW())>=21 AS True; -- true
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SELECT EXTRACT(CENTURY FROM TIMESTAMP '1970-03-20 04:30:00.00000'); -- 20
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-- on an interval
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SELECT EXTRACT(CENTURY FROM INTERVAL '100 y'); -- 1
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SELECT EXTRACT(CENTURY FROM INTERVAL '99 y'); -- 0
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SELECT EXTRACT(CENTURY FROM INTERVAL '-99 y'); -- 0
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SELECT EXTRACT(CENTURY FROM INTERVAL '-100 y'); -- -1
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--
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-- test trunc function!
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--
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SELECT DATE_TRUNC('MILLENNIUM', TIMESTAMP '1970-03-20 04:30:00.00000'); -- 1001
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SELECT DATE_TRUNC('MILLENNIUM', DATE '1970-03-20'); -- 1001-01-01
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SELECT DATE_TRUNC('CENTURY', TIMESTAMP '1970-03-20 04:30:00.00000'); -- 1901
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SELECT DATE_TRUNC('CENTURY', DATE '1970-03-20'); -- 1901
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SELECT DATE_TRUNC('CENTURY', DATE '2004-08-10'); -- 2001-01-01
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SELECT DATE_TRUNC('CENTURY', DATE '0002-02-04'); -- 0001-01-01
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SELECT DATE_TRUNC('CENTURY', DATE '0055-08-10 BC'); -- 0100-01-01 BC
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SELECT DATE_TRUNC('DECADE', DATE '1993-12-25'); -- 1990-01-01
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SELECT DATE_TRUNC('DECADE', DATE '0004-12-25'); -- 0001-01-01 BC
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SELECT DATE_TRUNC('DECADE', DATE '0002-12-31 BC'); -- 0011-01-01 BC
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--
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-- test infinity
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--
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select 'infinity'::date, '-infinity'::date;
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select 'infinity'::date > 'today'::date as t;
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select '-infinity'::date < 'today'::date as t;
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select isfinite('infinity'::date), isfinite('-infinity'::date), isfinite('today'::date);
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--
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-- oscillating fields from non-finite date/timestamptz:
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--
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SELECT EXTRACT(HOUR FROM DATE 'infinity'); -- NULL
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SELECT EXTRACT(HOUR FROM DATE '-infinity'); -- NULL
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SELECT EXTRACT(HOUR FROM TIMESTAMP 'infinity'); -- NULL
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SELECT EXTRACT(HOUR FROM TIMESTAMP '-infinity'); -- NULL
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SELECT EXTRACT(HOUR FROM TIMESTAMPTZ 'infinity'); -- NULL
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SELECT EXTRACT(HOUR FROM TIMESTAMPTZ '-infinity'); -- NULL
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-- all possible fields
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SELECT EXTRACT(MICROSECONDS FROM DATE 'infinity'); -- NULL
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SELECT EXTRACT(MILLISECONDS FROM DATE 'infinity'); -- NULL
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SELECT EXTRACT(SECOND FROM DATE 'infinity'); -- NULL
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SELECT EXTRACT(MINUTE FROM DATE 'infinity'); -- NULL
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SELECT EXTRACT(HOUR FROM DATE 'infinity'); -- NULL
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SELECT EXTRACT(DAY FROM DATE 'infinity'); -- NULL
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SELECT EXTRACT(MONTH FROM DATE 'infinity'); -- NULL
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SELECT EXTRACT(QUARTER FROM DATE 'infinity'); -- NULL
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SELECT EXTRACT(WEEK FROM DATE 'infinity'); -- NULL
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SELECT EXTRACT(DOW FROM DATE 'infinity'); -- NULL
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SELECT EXTRACT(ISODOW FROM DATE 'infinity'); -- NULL
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SELECT EXTRACT(DOY FROM DATE 'infinity'); -- NULL
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SELECT EXTRACT(TIMEZONE FROM DATE 'infinity'); -- NULL
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SELECT EXTRACT(TIMEZONE_M FROM DATE 'infinity'); -- NULL
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SELECT EXTRACT(TIMEZONE_H FROM DATE 'infinity'); -- NULL
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--
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-- monotonic fields from non-finite date/timestamptz:
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--
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SELECT EXTRACT(EPOCH FROM DATE 'infinity'); -- Infinity
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SELECT EXTRACT(EPOCH FROM DATE '-infinity'); -- -Infinity
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SELECT EXTRACT(EPOCH FROM TIMESTAMP 'infinity'); -- Infinity
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SELECT EXTRACT(EPOCH FROM TIMESTAMP '-infinity'); -- -Infinity
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SELECT EXTRACT(EPOCH FROM TIMESTAMPTZ 'infinity'); -- Infinity
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SELECT EXTRACT(EPOCH FROM TIMESTAMPTZ '-infinity'); -- -Infinity
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-- all possible fields
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SELECT EXTRACT(YEAR FROM DATE 'infinity'); -- Infinity
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SELECT EXTRACT(DECADE FROM DATE 'infinity'); -- Infinity
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SELECT EXTRACT(CENTURY FROM DATE 'infinity'); -- Infinity
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SELECT EXTRACT(MILLENNIUM FROM DATE 'infinity'); -- Infinity
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SELECT EXTRACT(JULIAN FROM DATE 'infinity'); -- Infinity
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SELECT EXTRACT(ISOYEAR FROM DATE 'infinity'); -- Infinity
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SELECT EXTRACT(EPOCH FROM DATE 'infinity'); -- Infinity
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--
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-- wrong fields from non-finite date:
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--
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SELECT EXTRACT(MICROSEC FROM DATE 'infinity'); -- ERROR: timestamp units "microsec" not recognized
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SELECT EXTRACT(UNDEFINED FROM DATE 'infinity'); -- ERROR: timestamp units "undefined" not supported
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-- test constructors
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select make_date(2013, 7, 15);
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select make_time(8, 20, 0.0);
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-- should fail
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select make_date(2013, 2, 30);
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select make_date(2013, 13, 1);
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select make_date(2013, 11, -1);
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select make_date(-44, 3, 15); -- perhaps we should allow this sometime?
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select make_time(10, 55, 100.1);
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select make_time(24, 0, 2.1);
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