How Can I Calculate the Total Hours From Time Differences in MySQL?

Calculating the Sum of Time Differences in MySQL

As you mentioned, you have a table with date-time values in a specific format and would like to calculate the total hours for a given period, such as a week.

To calculate the difference between the start and end time values, you can use the TIMEDIFF() function. However, you might encounter issues when trying to sum the returned values.

To address this, consider using the following approach:

SELECT
  SEC_TO_TIME(SUM(TIME_TO_SEC(`time`))) AS total_time
FROM time_table;

In this query:

• time represents the column containing the time values.
• TIMEDIFF() calculates the difference between the current start and end time values, returning the result in seconds.
• TIME_TO_SEC() converts the time difference from seconds to hours.
• SUM() adds up the hours for all rows in the table.
• SEC_TO_TIME() converts the total seconds back into a time format, displaying it as "xx:xx:xx."

This approach will provide you with the total time as a formatted time string, such as "40:53."

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