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This article will explain in detail how to use the time difference function TIMESTAMPDIFF. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

We frequently use the comparison and judgment of date and time in writing sql statements, especially in stored procedures, so give an example of the usage of the two time difference comparison function timestampdiff.

How's timestampdiff?

Datediff function. The return value is the number of days of difference, and cannot be located to hours, minutes, and seconds.

-- A difference of 2 days

Selectdatediff ('2018-03-2209)

TIMESTAMPDIFF function, with parameters set, can be accurate to days (DAY), hours (HOUR), minutes (MINUTE) and seconds (SECOND). It is more flexible to use than the datediff function. For the comparison of the two times, the small time is put in front and the big time is put in the back.

-- A difference of one day

SelectTIMESTAMPDIFF (DAY,'2018-03-2023)

The difference is 49 hours.

SelectTIMESTAMPDIFF (HOUR,'2018-03-2009)

-- A difference of 2940 minutes

SelectTIMESTAMPDIFF (MINUTE,'2018-03-2009)

-- A difference of 176400 seconds

SelectTIMESTAMPDIFF (SECOND,'2018-03-2009)

The usage of time difference function TIMESTAMPDIFF and DATEDIFF

How to write in a stored procedure:

Note: var_committime is the time that needs to be compared in the previous business.

-- get the current time

SETvar_current_time=CONCAT (CURDATE (),'', CURTIME ())

-- time comparison

SETvar_time_diff=TIMESTAMPDIFF (MINUTE,var_committime,var_current_time)

-to determine whether the unaudited contract has not been processed for more than 48 hours, and if it exceeds it, the subsequent logical processing will be carried out, otherwise it will not be processed.

IF (var_time_diff > 2880) THEN

-- related business logic processing

ENDIF

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