STDDEV() function in MySQL

SUBDATE() function in MySQL

Last Updated : 27 Nov, 2020

SUBDATE() function in MySQL is used to subtracts a time value (as interval) from a given date. Syntax :

SUBDATE(date, INTERVAL expr unit)

Parameter : This function accepts three parameters as given below : date : First specified date. expr : The value of the time/date interval to subtract. unit : The type of interval. It Can be one of the following values :

MICROSECOND
SECOND
MINUTE
HOUR
DAY
WEEK
MONTH
QUARTER
YEAR
SECOND_MICROSECOND
MINUTE_MICROSECOND
MINUTE_SECOND
HOUR_MICROSECOND
HOUR_SECOND
HOUR_MINUTE
DAY_MICROSECOND
DAY_SECOND
DAY_MINUTE
DAY_HOUR
YEAR_MONTH

Returns : It returns the date after subtracting a time/date interval. Example-1 : Subtracting a interval value from a date and returning the date where date is specified in the format of YYYY-MM-DD and Interval in Days :

SELECT SUBDATE("2020-11-25", INTERVAL 30 DAY) 
AS RESULTANTDATE;

Output :

RESULTANTDATE
2020-10-26

Example-2 : Subtracting a interval value from a date and returning the date where date is specified in the format of YYYY-MM-DD and Interval in Negative months :

SELECT SUBDATE("2020-11-25", INTERVAL -02 MONTH) 
AS RESULTANTDATE;

Output :

RESULTANTDATE
2021-01-25

Example-3 : Subtracting a interval value from a date and returning the date where date is specified in the format of YYYY-MM-DD and Interval in HOUR.

SELECT SUBDATE("2020-11-25 04:12:06",  INTERVAL 09 HOUR) 
AS RESULTANTDATE;

Output :

RESULTANTDATE
2020-11-24 19:12:06

Example-4 : Subtracting a interval value from a date and returning the date where date is specified in the format of YYYY-MM-DD and Interval in QUARTER.

SELECT SUBDATE("2020-11-25 04:12:06",  INTERVAL 09 QUARTER) 
AS RESULTANTDATE;

Output :

RESULTANTDATE
2018-08-25 04:12:06

Example 5 : Subtracting a interval value from a date and returning the date where date is specified in the format of YYYY-MM-DD and Interval in -YEAR.

SELECT SUBDATE("2020-11-25 12:19:36",  INTERVAL -01 YEAR) 
AS RESULTANTDATE;

Output :

RESULTANTDATE
2021-11-25 12:19:36

STDDEV() function in MySQL

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