MICROSECOND(expr)

返回從時間或日期時間表達式expr的微秒，範圍從0到999999的數字。

mysql> SELECT MICROSECOND('12:00:00.123456');
+---------------------------------------------------------+
| MICROSECOND('12:00:00.123456')                          |
+---------------------------------------------------------+
| 123456                                                  |
+---------------------------------------------------------+
1 row in set (0.00 sec)