DATE_ADD
Sintassi
DATE_ADD(data, INTERVAL espr unità), DATE_SUB(data, INTERVAL espr unità)
Spiegazione
Queste funzioni effettuando un calcolo aritmetico sulle date. L'argomento data specifica il valore iniziale di tipo date o datetime. espr è un'espressione che specifica l'intervallo da aggiungere o sottrarre alla data iniziale. espr è una stringa; può iniziare con "-
" per gli intervalli negativi. unità rappresenta una parola riservata che indica l'unità di misura delle relative espressioni.
Esempi
MariaDB [(none)]> SELECT '2008-12-31 23:59:59' + INTERVAL 1 SECOND; +-------------------------------------------+ | '2008-12-31 23:59:59' + INTERVAL 1 SECOND | +-------------------------------------------+ | 2009-01-01 00:00:00 | +-------------------------------------------+ 1 row in set (0.00 sec)
MariaDB [(none)]> SELECT INTERVAL 1 DAY + '2008-12-31'; +-------------------------------+ | INTERVAL 1 DAY + '2008-12-31' | +-------------------------------+ | 2009-01-01 | +-------------------------------+ 1 row in set (0.00 sec)
MariaDB [(none)]> SELECT '2005-01-01' - INTERVAL 1 SECOND; +----------------------------------+ | '2005-01-01' - INTERVAL 1 SECOND | +----------------------------------+ | 2004-12-31 23:59:59 | +----------------------------------+ 1 row in set (0.00 sec)
MariaDB [(none)]> SELECT DATE_ADD('2000-12-31 23:59:59', -> INTERVAL 1 SECOND); +----------------------------------------------------+ | DATE_ADD('2000-12-31 23:59:59', INTERVAL 1 SECOND) | +----------------------------------------------------+ | 2001-01-01 00:00:00 | +----------------------------------------------------+ 1 row in set (0.00 sec)
MariaDB [(none)]> SELECT DATE_ADD('2010-12-31 23:59:59', -> INTERVAL 1 DAY); +-------------------------------------------------+ | DATE_ADD('2010-12-31 23:59:59', INTERVAL 1 DAY) | +-------------------------------------------------+ | 2011-01-01 23:59:59 | +-------------------------------------------------+ 1 row in set (0.00 sec)
MariaDB [(none)]> SELECT DATE_ADD('2100-12-31 23:59:59', -> INTERVAL '1:1' MINUTE_SECOND); +---------------------------------------------------------------+ | DATE_ADD('2100-12-31 23:59:59', INTERVAL '1:1' MINUTE_SECOND) | +---------------------------------------------------------------+ | 2101-01-01 00:01:00 | +---------------------------------------------------------------+ 1 row in set (0.00 sec)
MariaDB [(none)]> SELECT DATE_SUB('2005-01-01 00:00:00', -> INTERVAL '1 1:1:1' DAY_SECOND); +----------------------------------------------------------------+ | DATE_SUB('2005-01-01 00:00:00', INTERVAL '1 1:1:1' DAY_SECOND) | +----------------------------------------------------------------+ | 2004-12-30 22:58:59 | +----------------------------------------------------------------+ 1 row in set (0.00 sec)
MariaDB [(none)]> SELECT DATE_ADD('1900-01-01 00:00:00', -> INTERVAL '-1 10' DAY_HOUR); +------------------------------------------------------------+ | DATE_ADD('1900-01-01 00:00:00', INTERVAL '-1 10' DAY_HOUR) | +------------------------------------------------------------+ | 1899-12-30 14:00:00 | +------------------------------------------------------------+ 1 row in set (0.00 sec)
MariaDB [(none)]> SELECT DATE_SUB('1998-01-02', INTERVAL 31 DAY); +-----------------------------------------+ | DATE_SUB('1998-01-02', INTERVAL 31 DAY) | +-----------------------------------------+ | 1997-12-02 | +-----------------------------------------+ 1 row in set (0.00 sec)
MariaDB [(none)]> SELECT DATE_ADD('1992-12-31 23:59:59.000002', -> INTERVAL '1.999999' SECOND_MICROSECOND); +--------------------------------------------------------------------------------+ | DATE_ADD('1992-12-31 23:59:59.000002', INTERVAL '1.999999' SECOND_MICROSECOND) | +--------------------------------------------------------------------------------+ | 1993-01-01 00:00:01.000001 | +--------------------------------------------------------------------------------+ 1 row in set (0.00 sec) MariaDB [(none)]>
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