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MySQL date function
2022-07-06 17:01:00 【My71】
The database used in the following , May refer to Create exercise database
Return current date
function :CURDATE()
Instructions
SELECT CURDATE();
Running results
Return current time
function :CURTIME()
Instructions
SELECT CURTIME();
Running results
Returns the current date and time
function :NOW()
Instructions
SELECT NOW()
Running results
Extract date value
function :DATE()
Instructions
SELECT DATE('2021-10-31 11:36:20')
Running results
Extract the year value
function :YEAR()
Instructions
SELECT YEAR('2021-10-31 11:36:20')
Running results
Extract the month value
function :MONTH()
Instructions
SELECT MONTH('2021-10-31 11:36:20')
Running results
Extract the day value
function :DAY()
Instructions
SELECT DAY('2021-10-31 11:36:20')
Running results
Extract the hour value
function :HOUR()
Instructions
SELECT HOUR('2021-10-31 11:36:20')
Running results
Extract the minute value
function :MINUTE()
Instructions
SELECT MINUTE('2021-10-31 11:36:20')
Running results
Extract second value
function :SECOND()
Instructions
SELECT SECOND('2021-10-31 11:36:20')
Running results
Convert seconds into time
function :SEC_TO_TIME
Instructions
SELECT SEC_TO_TIME(3661)
Running results
Turn the time into seconds
function :TIME_TO_SEC()
Instructions
SELECT TIME_TO_SEC('1:01:01')
Running results
Calculation n Days after
function :ADDDATE(d,n)
explain :d Indicates the date ,n Days .
Instructions
SELECT ADDDATE('2021-10-31',10)
Running results
Calculation n The day before
function :SUBDATE(d,n)
explain :d Indicates the date ,n Days .
Instructions
SELECT SUBDATE('2021-10-31 12:23:20',10)
Running results
Calculation n Time in seconds
function :ADDTIME(t,n)
explain :t Time ,n Indicates the time interval , When n When it is an integer, it should be less than 60, It can also be expressed as a string .
Instructions
SELECT ADDTIME('2021-10-31 11:43:25',5),ADDTIME('2021-10-31 11:43:25','2:10:15')
Running results
Calculation n Seconds ago
function :SUBTIME()
explain :t Time ,n Indicates the time interval , When n When it is an integer, it should be less than 60, It can also be expressed as a string .
Instructions
SELECT SUBTIME('2021-10-31 12:23:20',10),SUBTIME('2021-10-31 12:23:20','2:3:20')
Running results
Calculate the date interval
function :DATEDIFF(d1,d2)
explain :d1 End date ,d2 Start date .
Instructions
SELECT DATEDIFF('2022-01-01','2021-10-31'),DATEDIFF('2021-10-31','2022-01-01')
Running results
Calculate the time interval
function :TIMEDIFF(t1,t2)
explain :t1 It's the start time t2 End time
Instructions
SELECT TIMEDIFF('12:31:20','11:30:10')
Running results
practice : Calculation xs The ages of all the people in the table
Instructions
select Student number , full name , Date of birth ,DATEDIFF(NOW(), Date of birth ) DIV 365 as Age from xs;
Running results
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