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A function that adds or subtracts the specified time interval to date and time in MySQL

2019-11-21 14:41:36

label: MySQL, SQL Date Funcitons, DATE_ADD, DATE_SUB, ADDDATE, SUBDATE, INTERVAL, MySQL date function, MySQL date addition and subtraction

From a programming language perspective, date and time are relatively complex and advanced data types relative to integers and strings, and usage in various languages ​​is less uniform.

This article mainly explains the functions in MySQL that add or will specify the time interval for the date and time. Addition uses DATE_ADD(), and subtraction uses DATE_SUB()

DATE_ADD and DATE_SUB

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

ADDDATE and SUBDATE

SELECT ADDDATE('2019-11-11', INTERVAL 2 MONTH);
SELECT SUBDATE('2019-11-11', INTERVAL 2 MONTH);
These two functions are identical to the DATE_ADD and DATE_SUB functions except that INTERVAL can be omitted.

Here are a few simple examples:

The INTERVAL 2 MONTH is the time interval, INTERVAL is a fixed character, 2 is the quantity, and MONTH is the interval type. All types are as follows:
MICROSECOND
SECOND
MINUTE
HOUR
DAY
WEEK
MONTH
QUARTER
YEAR
It also supports more complex intervals, the corresponding format is as follows:
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'

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