What is the method for obtaining the millisecond information from a date in Oracle?

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One way to obtain the millisecond information from a date in Oracle is to use the EXTRACT function with the 'MICROSECOND' option. For example:

SELECT EXTRACT(MICROSECOND FROM sysdate) FROM dual;

This query will return the number of microseconds since the beginning of the current day, which can be divided by 1000 to obtain the millisecond value.