從日期獲取年，月或日

參考：

DECLARE @D DATETIME = GETDATE()

SELECT DATEPART(YEAR,@D) AS [YEAR], DATEPART(MONTH,@D) AS [MONTH], DATEPART(DAY,@D) AS [DAY] 

SELECT YEAR(@D) AS [YEAR], MONTH(@D) AS [MONTH], DAY(@D) AS [DAY]