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a2da77cdb4
The previous implementation of EXTRACT mapped internally to
date_part(), which returned type double precision (since it was
implemented long before the numeric type existed). This can lead to
imprecise output in some cases, so returning numeric would be
preferrable. Changing the return type of an existing function is a
bit risky, so instead we do the following: We implement a new set of
functions, which are now called "extract", in parallel to the existing
date_part functions. They work the same way internally but use
numeric instead of float8. The EXTRACT construct is now mapped by the
parser to these new extract functions. That way, dumps of views
etc. from old versions (which would use date_part) continue to work
unchanged, but new uses will map to the new extract functions.
Additionally, the reverse compilation of EXTRACT now reproduces the
original syntax, using the new mechanism introduced in
40c24bfef9.
The following minor changes of behavior result from the new
implementation:
- The column name from an isolated EXTRACT call is now "extract"
instead of "date_part".
- Extract from date now rejects inappropriate field names such as
HOUR. It was previously mapped internally to extract from
timestamp, so it would silently accept everything appropriate for
timestamp.
- Return values when extracting fields with possibly fractional
values, such as second and epoch, now have the full scale that the
value has internally (so, for example, '1.000000' instead of just
'1').
Reported-by: Petr Fedorov <petr.fedorov@phystech.edu>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/42b73d2d-da12-ba9f-570a-420e0cce19d9@phystech.edu
366 lines
11 KiB
SQL
366 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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INSERT INTO DATE_TBL VALUES ('2040-04-10 BC');
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SELECT f1 FROM DATE_TBL;
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SELECT f1 FROM DATE_TBL WHERE f1 < '2000-01-01';
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SELECT f1 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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-- Check upper and lower limits of date range
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SELECT date '4714-11-24 BC';
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SELECT date '4714-11-23 BC'; -- out of range
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SELECT date '5874897-12-31';
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SELECT date '5874898-01-01'; -- out of range
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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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SELECT f1 as "date",
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date_part('year', f1) AS year,
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date_part('month', f1) AS month,
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date_part('day', f1) AS day,
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date_part('quarter', f1) AS quarter,
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date_part('decade', f1) AS decade,
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date_part('century', f1) AS century,
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date_part('millennium', f1) AS millennium,
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date_part('isoyear', f1) AS isoyear,
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date_part('week', f1) AS week,
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date_part('dow', f1) AS dow,
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date_part('isodow', f1) AS isodow,
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date_part('doy', f1) AS doy,
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date_part('julian', f1) AS julian,
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date_part('epoch', f1) AS epoch
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FROM date_tbl;
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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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--
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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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-- all possible fields
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--
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SELECT EXTRACT(MICROSECONDS FROM DATE '2020-08-11');
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SELECT EXTRACT(MILLISECONDS FROM DATE '2020-08-11');
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SELECT EXTRACT(SECOND FROM DATE '2020-08-11');
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SELECT EXTRACT(MINUTE FROM DATE '2020-08-11');
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SELECT EXTRACT(HOUR FROM DATE '2020-08-11');
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SELECT EXTRACT(DAY FROM DATE '2020-08-11');
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SELECT EXTRACT(MONTH FROM DATE '2020-08-11');
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SELECT EXTRACT(YEAR FROM DATE '2020-08-11');
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SELECT EXTRACT(YEAR FROM DATE '2020-08-11 BC');
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SELECT EXTRACT(DECADE FROM DATE '2020-08-11');
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SELECT EXTRACT(CENTURY FROM DATE '2020-08-11');
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SELECT EXTRACT(MILLENNIUM FROM DATE '2020-08-11');
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SELECT EXTRACT(ISOYEAR FROM DATE '2020-08-11');
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SELECT EXTRACT(ISOYEAR FROM DATE '2020-08-11 BC');
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SELECT EXTRACT(QUARTER FROM DATE '2020-08-11');
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SELECT EXTRACT(WEEK FROM DATE '2020-08-11');
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SELECT EXTRACT(DOW FROM DATE '2020-08-11');
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SELECT EXTRACT(DOW FROM DATE '2020-08-16');
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SELECT EXTRACT(ISODOW FROM DATE '2020-08-11');
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SELECT EXTRACT(ISODOW FROM DATE '2020-08-16');
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SELECT EXTRACT(DOY FROM DATE '2020-08-11');
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SELECT EXTRACT(TIMEZONE FROM DATE '2020-08-11');
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SELECT EXTRACT(TIMEZONE_M FROM DATE '2020-08-11');
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SELECT EXTRACT(TIMEZONE_H FROM DATE '2020-08-11');
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SELECT EXTRACT(EPOCH FROM DATE '2020-08-11');
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SELECT EXTRACT(JULIAN FROM DATE '2020-08-11');
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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:
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--
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SELECT EXTRACT(DAY FROM DATE 'infinity'); -- NULL
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SELECT EXTRACT(DAY FROM DATE '-infinity'); -- NULL
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-- all supported fields
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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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--
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-- monotonic fields from non-finite date:
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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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-- all supported 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
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-- test constructors
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select make_date(2013, 7, 15);
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select make_date(-44, 3, 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(0, 7, 15);
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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_time(10, 55, 100.1);
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select make_time(24, 0, 2.1);
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