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MySQL Cookbook
book

MySQL Cookbook

by Paul DuBois
October 2002
Intermediate to advanced content levelIntermediate to advanced
1024 pages
27h 26m
English
O'Reilly Media, Inc.
Content preview from MySQL Cookbook

Converting Between Times and Seconds

Problem

You have a time value but you want a value in seconds, or vice versa.

Solution

TIME values are specialized representations of a simpler unit—seconds—and you can convert back and forth from one to the other using TIME_TO_SEC( ) and SEC_TO_TIME( ).

Discussion

TIME_TO_SEC( ) converts a TIME value to the equivalent number of seconds, and SEC_TO_TIME( ) does the opposite. The following query demonstrates a simple conversion in both directions:

mysql> SELECT t1,
    -> TIME_TO_SEC(t1) AS 'TIME to seconds',
    -> SEC_TO_TIME(TIME_TO_SEC(t1)) AS 'TIME to seconds to TIME'
    -> FROM time_val;
+----------+-----------------+-------------------------+
| t1       | TIME to seconds | TIME to seconds to TIME |
+----------+-----------------+-------------------------+
| 15:00:00 |           54000 | 15:00:00                |
| 05:01:30 |           18090 | 05:01:30                |
| 12:30:20 |           45020 | 12:30:20                |
+----------+-----------------+-------------------------+

To express time values as minutes, hours, or days, perform the appropriate divisions:

mysql> SELECT t1,
    -> TIME_TO_SEC(t1) AS 'seconds',
    -> TIME_TO_SEC(t1)/60 AS 'minutes',
    -> TIME_TO_SEC(t1)/(60*60) AS 'hours',
    -> TIME_TO_SEC(t1)/(24*60*60) AS 'days'
    -> FROM time_val; +----------+---------+---------+-------+------+ | t1 | seconds | minutes | hours | days | +----------+---------+---------+-------+------+ | 15:00:00 | 54000 | 900.00 | 15.00 | 0.62 | | 05:01:30 | 18090 | 301.50 | 5.03 | 0.21 | | 12:30:20 | 45020 | 750.33 | 12.51 | 0.52 | +----------+---------+---------+-------+------+ ...
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Publisher Resources

ISBN: 0596001452Catalog PageErrata