사용법)
Select GETDATE() - 2020-12-23 18:37:35.012
Select'년', DATEADD(Year, 1, GETDATE())
결과 2021-12-23 18:37:35.012
Select'년', DATEADD(Day, 1, GETDATE())
결과 2020-12-24 18:37:35.012