To compute the total elapsed time, use TIME_TO_SEC( ) to convert the values to seconds before summing them. : TIME_TO_SEC « Date Time « SQL / MySQL






  1. SQL / MySQL
  2. Date Time
  3. TIME_TO_SEC

To compute the total elapsed time, use TIME_TO_SEC( ) to convert the values to seconds before summing them.

      
mysql>
mysql>
mysql> CREATE TABLE time_val
    -> (
    ->  t1      TIME,
    ->  t2      TIME
    -> );
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> INSERT INTO time_val (t1,t2) VALUES('15:00:00','15:00:00');
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO time_val (t1,t2) VALUES('05:01:30','02:30:20');
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO time_val (t1,t2) VALUES('12:30:20','17:30:45');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> SELECT * FROM time_val;
+----------+----------+
| t1       | t2       |
+----------+----------+
| 15:00:00 | 15:00:00 |
| 05:01:30 | 02:30:20 |
| 12:30:20 | 17:30:45 |
+----------+----------+
3 rows in set (0.00 sec)

mysql>
mysql>
mysql> SELECT SUM(TIME_TO_SEC(t1)) AS 'total seconds',
    -> SEC_TO_TIME(SUM(TIME_TO_SEC(t1))) AS 'total time'
    -> FROM time_val;
+---------------+------------+
| total seconds | total time |
+---------------+------------+
|        117110 | 32:31:50   |
+---------------+------------+
1 row in set (0.00 sec)

mysql>
mysql>
mysql> drop table time_val;
Query OK, 0 rows affected (0.00 sec)








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1.Breaking Down Time Intervals into Components
2.If you pass TIME_TO_SEC( ) a date-and-time value, it extracts the time part and discards the date.
3.TIME_TO_SEC( ) converts a TIME value to the equivalent number of seconds
4.TIME_TO_SEC(): strips off the date part and returns the time part as the corresponding number of seconds:
5.Using TIME_TO_SEC( ) to strip off the date part of the t_create values
6.Transform the time differences into seconds using TIME_TO_SEC, add them, and then convert them back
7.To express time values as minutes, hours, or days, perform the appropriate divisions:
8.Forcing MySQL to Treat Strings as Temporal Values