MICROSECOND()
MICROSECOND(time)This function extracts the microseconds value of a given time. It displays the resulting number in six characters, padded with zeros to the right. When a date or datetime is given that does not include a specific value for microseconds, a value of zero microseconds is assumed. Therefore, 000000 is returned. This function is available as of version 4.1.1 of MySQL. Here is an example:
SELECT MICROSECOND('2008-01-11 19:28:45.82')
AS 'MicroSecond';
+--------------+
| MicroSecond |
+--------------+
| 820000 |
+--------------+