MySQL processes the current time based on a date field (minutes)

Scenes:

According to the table required operation_timefield is more than ten minutes from time as the current conditions, the update data fields

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• To use the function: unix_timestamp(now())calculates the current time to the 1970-01-01 00:00:00'year the number of seconds
• So the SQL to calculate the current time and the number of minutes in a field in the table exceeds 10 minutes is:

SELECT
	* 
FROM
	st_machine sm 
WHERE
	( unix_timestamp( now())- unix_timestamp( sm.operation_time ) )/ 60 > 10

• Use this as a condition to update other fields SQL as:

        UPDATE st_machine sm
        SET sm.`online` = 0
        WHERE
            (
            UNIX_TIMESTAMP(
            now())- UNIX_TIMESTAMP( sm.operation_time ))/ 60 > 10