SyntaxFix

[sql] DATEDIFF function in Oracle

You can simply subtract two dates. You have to cast it first, using to_date:

select to_date('2000-01-01', 'yyyy-MM-dd')
       - to_date('2000-01-02', 'yyyy-MM-dd')
       datediff
from   dual
;

The result is in days, to the difference of these two dates is -1 (you could swap the two dates if you like). If you like to have it in hours, just multiply the result with 24.

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