Mega Code Archive
Calculating Intervals Between Times
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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 t1, t2,
-> TIME_TO_SEC(t2) - TIME_TO_SEC(t1) AS 'interval in seconds',
-> SEC_TO_TIME(TIME_TO_SEC(t2) - TIME_TO_SEC(t1)) AS 'interval as TIME'
-> FROM time_val;
+----------+----------+---------------------+------------------+
| t1 | t2 | interval in seconds | interval as TIME |
+----------+----------+---------------------+------------------+
| 15:00:00 | 15:00:00 | 0 | 00:00:00 |
| 05:01:30 | 02:30:20 | -9070 | -02:31:10 |
| 12:30:20 | 17:30:45 | 18025 | 05:00:25 |
+----------+----------+---------------------+------------------+
3 rows in set (0.00 sec)
mysql>
mysql> drop table time_val;
Query OK, 0 rows affected (0.00 sec)
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