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Funkcija koja dodaje ili oduzima navedeni vremenski interval do datuma i vremena u MySQL-u

2019-11-21 14:41:36

oznaka: MySQL, SQL Date Funcitons, DATE_ADD, DATE_SUB, ADDDATE, SUBDATE, INTERVAL, MySQL datumska funkcija, MySQL dodavanje datuma i oduzimanje

Iz perspektive programskog jezika, datum i vrijeme su relativno složeni i napredni tipovi podataka u odnosu na cijele brojeve i nizove, a upotreba u raznim jezicima je manje ujednačena.

Ovaj članak uglavnom objašnjava funkcije u MySQL-u koje dodaju ili određuju vremenski interval za datum i vrijeme.Dodavanje koristi DATE_ADD () , a oduzimanje koristi DATE_SUB ()

DATE_ADD i DATE_SUB

SELECT DATE_ADD('2019-11-11', INTERVAL 2 MONTH);
SELECT DATE_SUB('2019-11-11', INTERVAL 2 MONTH);

DODATAK I PODDAT

SELECT ADDDATE('2019-11-11', INTERVAL 2 MONTH);
SELECT SUBDATE('2019-11-11', INTERVAL 2 MONTH);
Ove su dvije funkcije identične funkcijama DATE_ADD i DATE_SUB, osim što INTERVAL može biti izostavljen.

Evo nekoliko jednostavnih primjera:

INTERVAL 2 MONTH Je vremenski interval, INTERVAL je fiksni znak, 2 je količina, MONTH je interval, svi tipovi su kako slijedi:
MICROSECOND
SECOND
MINUTE
HOUR
DAY
WEEK
MONTH
QUARTER
YEAR
Podržava i složenije intervale, odgovarajući format je sljedeći:
SECOND_MICROSECOND	'SECONDS.MICROSECONDS'
MINUTE_MICROSECOND	'MINUTES:SECONDS.MICROSECONDS'
MINUTE_SECOND	'MINUTES:SECONDS'
HOUR_MICROSECOND	'HOURS:MINUTES:SECONDS.MICROSECONDS'
HOUR_SECOND	'HOURS:MINUTES:SECONDS'
HOUR_MINUTE	'HOURS:MINUTES'
DAY_MICROSECOND	'DAYS HOURS:MINUTES:SECONDS.MICROSECONDS'
DAY_SECOND	'DAYS HOURS:MINUTES:SECONDS'
DAY_MINUTE	'DAYS HOURS:MINUTES'
DAY_HOUR	'DAYS HOURS'
YEAR_MONTH	'YEARS-MONTHS'

oznaka

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