MySQL:

MICROSECOND

Syntax:
MICROSECOND(expr)

Returns the microseconds from the time or datetime expression expr as a
number in the range from 0 to 999999.

mysql> SELECT MICROSECOND('12:00:00.123456');
-> 123456
mysql> SELECT MICROSECOND('2019-12-31 23:59:59.000010');
-> 10

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