Date Time Functions MySQL Tutorial

mysql>
mysql> SELECT EXTRACT(DAY_HOUR FROM '2003-01-02 10:30:00.000123');
+-----------------------------------------------------+
| EXTRACT(DAY_HOUR FROM '2003-01-02 10:30:00.000123') |
+-----------------------------------------------------+
|                                                 210 |
+-----------------------------------------------------+
1 row in set (0.00 sec)
mysql>