SQL Server 2008 DateTime math

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SQL-Server-2008

How come:

SELECT CURRENT_TIMESTAMP - 5 as [Subtract 5 what?]

yields the current date/time - 5 days?

Based on the documentation I would expect it to subtract 5 'ticks.'

Posted 11-Apr-10 16:07pm

someotherdavid

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Not Active · Accepted Answer · 2010-04-11T16:38:00

You could have easily checked this by running the query
SELECT CURRENT_TIMESTAMP, CURRENT_TIMESTAMP - 5
and comparing the results

"The Transact-SQL timestamp data type is not the same as the timestamp data type defined in the SQL-92 standard. The SQL-92 timestamp data type is equivalent to the Transact-SQL datetime data type"

http://msdn.microsoft.com/en-us/library/aa260631(SQL.80).aspx[^]

So the answer is days, not ticks