SQL calculate time difference between two rows

1. How do I calculate time difference in SQL?
2. How can I find the difference between two rows in SQL?
3. Can you subtract timestamps in SQL?

How do I calculate time difference in SQL?

The TIMEDIFF() function returns the difference between two time/datetime expressions. Note: time1 and time2 should be in the same format, and the calculation is time1 - time2.

How can I find the difference between two rows in SQL?

To calculate a difference, you need a pair of records; those two records are “the current record” and “the previous year's record”. You obtain this record using the LAG() window function. This function allows you to obtain data from the previous record (based on an order criterion, which here is “ ORDER BY year ”).

Can you subtract timestamps in SQL?

Discussion: To calculate the difference between the timestamps in MySQL, use the TIMESTAMPDIFF(unit, start, end) function. The unit argument can be MICROSECOND , SECOND , MINUTE , HOUR , DAY , WEEK , MONTH , QUARTER , or YEAR . To get the difference in seconds as we have done here, choose SECOND .