How to calculate Number of Hours between 2 dates

Hi,
I have a Column in a table of datatype DATE i.e. Update_Date. Now How do I calculate number of hours passed starting from this date entered in the Update_Date column to SYSDATE. e.g. if the date in column is 2-FEB-2009 and the sysdate is 2/2/2009 2:07:40 AM it should give me 24. How can I get this number of hours.
Update_Date - Sysdate = Number of Hours.
Thanks

When you subtract two dates in Oracle, you get a difference in terms of days. Just multiply that by 24 to get hours.
SELECT (sysdate - update_date) days,
(sysdate - update_date) * 24 hours
FROM your_tableThat said, it is not obvious how your example works. You state
if the date in column is 2-FEB-2009 and the sysdate is 2/2/2009 2:07:40 AM it should give me 24Since both dates are on February 2, 2009, the only difference is in the time component. If we assume that the time component of the UPDATE_DATE value is midnight since it is not specified, there is a little more than 2 hours of difference between the two dates. How is it that you determine there are 24 hours of difference?
Justin
Edited by: Justin Cave on Feb 2, 2009 10:39 AM

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