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Databases :: MySql :: Substracting TIME values
By: Squibi U.S.A.  Date: 06/10/2003 00:00:00  English  Points: 20 Status: Answered
Quality : Excellent
Hi,

I want to substract two TIME column values, and insert the resultant value in a third TIME column. What is the best way to do this?

I tried using the basic - operator but the resultant value is not a TIME value, so I can not insert it in the third column.

Thanks
By: VGR Date: 07/10/2003 18:37:00 English  Type : Comment
true. The result should be an integer of some sort (after all, it is NOT a time, you understand this ? ;-)

but you could format it to a TIME value using the various "date and time functions"
By: VGR Date: 07/10/2003 18:39:00 English  Type : Comment
Also : TIMEDIFF(ARGUMENTS)

(added in 4.1.1.)
By: VGR Date: 07/10/2003 18:40:00 English  Type : Comment
in fact, I suggest you simply do SEC_TO_TIME(timediff)
By: VGR Date: 07/10/2003 18:42:00 English  Type : Answer
found.

mysql> select TIME_TO_SEC('10:00:34')-time_to_sec('09:00:30');
+-------------------------------------------------+
| TIME_TO_SEC('10:00:34')-time_to_sec('09:00:30') |
+-------------------------------------------------+
| 3604 |
+-------------------------------------------------+
1 row in set (0.03 sec)

mysql> select SEC_TO_TIME(TIME_TO_SEC('10:00:34')-time_to_sec('09:00:30'));
+--------------------------------------------------------------+
| SEC_TO_TIME(TIME_TO_SEC('10:00:34')-time_to_sec('09:00:30')) |
+--------------------------------------------------------------+
| 01:00:04 |
+--------------------------------------------------------------+
1 row in set (0.05 sec)

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