Using TIME_TO_SEC( ) to strip off the date part of the t_create values : TIME_TO_SEC « Date Time « SQL / MySQL






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  2. Date Time
  3. TIME_TO_SEC

Using TIME_TO_SEC( ) to strip off the date part of the t_create values

      
mysql>
mysql> CREATE TABLE tsdemo2
    -> (
    ->     t_update TIMESTAMP, # record last-modification time
    ->     t_create TIMESTAMP, # record creation time
    ->     val INT
    -> );
Query OK, 0 rows affected (0.01 sec)

mysql>
mysql> INSERT INTO tsdemo2 (t_update,t_create,val) VALUES(NULL,NULL,5);
Query OK, 1 row affected (0.00 sec)

mysql> SELECT * FROM tsdemo2;
+---------------------+---------------------+------+
| t_update            | t_create            | val  |
+---------------------+---------------------+------+
| 2011-10-03 13:05:53 | 2011-10-03 13:05:53 |    5 |
+---------------------+---------------------+------+
1 row in set (0.00 sec)

mysql>
mysql> UPDATE tsdemo2 SET val = val + 1;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> SELECT * FROM tsdemo2;
+---------------------+---------------------+------+
| t_update            | t_create            | val  |
+---------------------+---------------------+------+
| 2011-10-03 13:05:53 | 2011-10-03 13:05:53 |    6 |
+---------------------+---------------------+------+
1 row in set (0.00 sec)

mysql>
mysql>
mysql> SELECT * FROM tsdemo2
    -> WHERE TIME_TO_SEC(t_create)
    -> BETWEEN TIME_TO_SEC('13:00:00') AND TIME_TO_SEC('16:00:00');
+---------------------+---------------------+------+
| t_update            | t_create            | val  |
+---------------------+---------------------+------+
| 2011-10-03 13:05:53 | 2011-10-03 13:05:53 |    6 |
+---------------------+---------------------+------+
1 row in set (0.00 sec)

mysql>
mysql>
mysql> drop table tsdemo2;
Query OK, 0 rows affected (0.00 sec)








Related examples in the same category

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