If I get the time twice in one SQL, is it possible to get different results?

[vuvcpg]

eg:

SELECT DATEDIFF(millisecond, GETDATE(), GETDATE())

and

SELECT DATEDIFF(millisecond, GETDATE(), CURRENT_TIMESTAMP)

Can I get a number greater than 0 millisecond?

[#2]

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SELECT DATEDIFF(millisecond, GETDATE(), GETDATE())

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@vuvcpg , what on earth do you expect here for a result different the 0 milliseconds? The function GETDATE() is evaluated at once, so the query can't ever return something different the 0 ms.