The MICROSECOND function returns the microsecond part of a value.

>>-MICROSECOND--(--expression--)-------------------------------><
- expression
- An expression that returns a value of one of the following
built-in data types: a timestamp, a character string, a graphic string, or
a numeric data type.
- If expression is a character or graphic string,
it must not be a CLOB or DBCLOB, and its value must be a valid
string representation of a timestamp. For the valid formats of string representations
of timestamps, see String representations of datetime values.
- If expression is a number, it must be a timestamp
duration. For the valid formats of datetime durations, see Datetime operands and durations.
The result of the function is a large integer. If the argument
can be null, the result can be null; if the argument is null, the result is
the null value.
The other rules depend on the data type of the argument:
- If the argument is a timestamp or a valid character-string representation
of a timestamp:
The result is the microsecond part of the value, which
is an integer between 0 and 999999.
- If the argument is a duration:
The result is the microsecond part
of the value, which is an integer between -999999 and 999999. A nonzero result
has the same sign as the argument.