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DATEDIFF() function: find difference in date and time

In SQL server if you have columns which are of Date/Time type then sometimes you need to find their difference for passing into the application when needed. So for doing that SQL Server provides a ...
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Provide ability to get exact results when use timestamp arithmetic with fractional part of second (DATEADD(), DATEDIFF()).

SQL> select dateadd(-55.499 second to timestamp '01.01.2000 00:00:55.499') from rdb$database; 2000-01-01 00:00:00.4990 SQL> select dateadd(-55.501 second to timestamp ...