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46be0c18f1
> why does CVS tip still give me > > regression=# select extract(century from now()); > date_part > ----------- > 20 > (1 row) > [ ... looks in code ... ] > > Apparently it's because you fixed only timestamp_part, and not > timestamptz_part. I'm not too sure about what timestamp_trunc or > timestamptz_trunc should do, but they may be wrong as well. Sigh... as usual, what is not tested does not work:-( > Could we have a more complete patch? Please find a submission attached. I hope it really fixes all decade, century and millenium issues for extract and *_trunc functions on interval and other timestamp types. If someone could check that the results are reasonnable, it would be great. I indeed overlooked the fact that there were two functions. The patch fixes the code so that both variants agree. I added comments to interval extractions, because it relies on the C division to have a negative remainder: -7/10 = 0 and remains -7. As for *_trunc functions, I have chosen to put the first year of the century or millennium: -100, 1, 101... 1001 2001 etc. Indeed, I don't think it would make sense to put 2000 (last year of the 2nd millennium) for rounding all years of the third millenium. I also fixed the code so that all decades last 10 years and decade 199 means the 1990's. I have added some tests that are relevant to deal with tricky cases. The formula may be simplified, but all these cases must pass. Please keep them. Fabien Coelho
272 lines
7.5 KiB
SQL
272 lines
7.5 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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-- 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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