calculate a sum of type time using sql

Question

How to caculate sum of times of my colonne called \"timeSpent\" having this format: HH:mm in SQL? I am using MySQL.

the type of my column is Time.

it has th

Answer 1

In MySQL, you would do something like this to get the time interval:

SELECT TIMEDIFF('08:00:00', '10:00:00');

Then to add the time intervals, you would do:

SELECT ADDTIME('01:00:00', '01:30:00');

Unfortunately, you're not storing dates or using 24-hour time, so these calculations would end up incorrect since your TimeUntil is actually lower than your TimeFrom.

Another approach would be (assuming you sort out the above issue) to store the time intervals as seconds using TIMESTAMPDIFF():

UPDATE my_table SET time_spent=TIMESTAMPDIFF(start, end));
SELECT SEC_TO_TIME(SUM(time_spent)) FROM my_table;