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Finding precise difference in time and date values

What is the best function/way to find the difference in time and date value in the range of 1/1000th precision?

e.g., Time: 25.456 (sec) - 22.349 (sec)
Time: 25-Sep-06 15:44:22.453 - 20-Sep-06 17:22:45.276

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The only Oracle datatype that will handle fractional seconds is the TIMESTAMP datatype. Once you have two values stored as timestamps, the easisest way to find the difference is to just subtract the two values. For instance:
SELECT TO_TIMESTAMP('MM/DD/YY HH24:MI:SS.SSS','09/25/06 15:22:22.453') - 
              TO_TIMESTAMP('MM/DD/YY HH24:MI:SS.SSS','09/20/06 17:22:45.276') 
FROM dual;

This was first published in October 2006

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