日期参数sql

Question

我正在写一个函数，它声明一个变量@StartDate是一月份的第一个，但是一年是运行脚本的当年（当年），这意味着年份可以改变，一个月不能。

任何人都知道如何做到这一点？

示例代码：

IF @DATE_TYPE = '第一季度'

BEGIN

SET @START_DATE = 01/01/'当前年份'

SET @END_DATE = 31/03/'当年'

END

Answer 1

对于SQL 2012及以上版本，

SELECT DATEFROMPARTS (YEAR(GETDATE()), 1, 1) 
SELECT DATEFROMPARTS (YEAR(GETDATE()), 03, 31) 

对于所有版本，

SELECT CAST('01 JAN '+CAST(DATEPART(YY,GETDATE()) AS NVARCHAR) AS DATETIME) 
SELECT CAST('31 MAR '+CAST(DATEPART(YY,GETDATE()) AS NVARCHAR) AS DATETIME) 

Answer 2

我想你可以d Ø这样的事情（这是更好，当你确定日期，而不是隐式转换使用convert（））：

SET @START_DATE = CONVERT(datetime, CAST(YEAR(GETDATE()) AS VARCHAR(4)) + '0101', 112) 
    SET @END_DATE = CONVERT(datetime, CAST(YEAR(GETDATE()) AS VARCHAR(4)) + '0331', 112) 

Answer 3

在SQL 2012+，你可以使用Datefromparts

IF @DATE_TYPE = 'FIRST QUARTER' 
BEGIN 
    SET @START_DATE = datefromparts(year(getdate()), 1,1) 
    SET @END_DATE = datefromparts(year(getdate()), 3,31) 
END 

如果你想获得最前一页日期和季度的最后日期，然后如果你使用的SQLSERVER 2012使用它

DECLARE @CurrentDate datetime = '2017-07-01' -- or getdate() or any date 
SELECT datefromparts(year(@CurrentDate), 
       datepart(quarter, @CurrentDate) * 3 - 2,1) AS StartDate, 
     EOMONTH(datefromparts(year(@CurrentDate), 
       datepart(quarter, @CurrentDate) * 3 , 1)) AS EndDate 

Answer 4

，您可以使用DATEFROMPARTS

 DECLARE @START_DATE DATE, 
       @END_DATE DATE 

     SELECT @START_DATE = DATEFROMPARTS(YEAR(GETDATE()), 1, 1) , 
       @END_DATE = DATEFROMPARTS(YEAR(GETDATE()), 03, 31) 

     SELECT @START_DATE [start_date] , 
       @END_DATE [end_date] 

结果：

start_date  end_date 
    ----------  ---------- 
    2017-01-01  2017-03-31 

    (1 row(s) affected) 

Answer 5

DECLARE @START_DATE DATETIME 

DECLARE @END_DATE DATETIME 

DECLARE @DATE_TYPE VARCHAR(500) 

DECLARE @YEAR VARCHAR(4) 

SET @DATE_TYPE = 'FIRST QUARTER' -- SAMPLE PARAMETER 

SET @YEAR = CAST(YEAR(GETDATE()) AS VARCHAR(4)) 

DECLARE @tbl TABLE ([QUARTER] VARCHAR(50), StartMonth VARCHAR(2), EndMonth VARCHAR(2)) 

INSERT INTO @tbl ([QUARTER], StartMonth, EndMonth) 

SELECT 'FIRST QUARTER', '1', '3' 

UNION ALL 

SELECT 'SECOND QUARTER', '4', '6' 

UNION ALL 

SELECT 'THIRD QUARTER', '7', '9' 

UNION ALL 

SELECT 'FOURTH QUARTER', '10', '12' 




SELECT @START_DATE = StartMonth + '/1/' + @YEAR, 
    @END_DATE = DATEADD(DD, -1, (DATEADD(mm, 1, EndMonth + '/1/' + @YEAR))) 

FROM @tbl 

WHERE [QUARTER] = @DATE_TYPE 

Answer 6

DECLARE @Day VARCHAR(10) = '1stQUARTER' --Give the quarter name condiations like 1stQUARTER,2ndQUARTER,3rdQUARTER,4thQuarter 

IF (@Day = '1stQUARTER') 
BEGIN 
    SELECT CASE 
      WHEN DATENAME(QUARTER, getdate()) - 1 = 1 
       THEN DATEADD(qq, DATEDIFF(qq, 0, GETDATE()) - 1, 0) 
      END AS StartDayQuarter 
     ,CASE 
      WHEN DATENAME(QUARTER, getdate()) - 1 = 1 
       THEN DATEADD(dd, - 1, DATEADD(qq, DATEDIFF(qq, 0, GETDATE()), 0)) 
      END AS EndDayQuarter 
END 
ELSE IF (@Day = '2ndQUARTER') 
BEGIN 
    SELECT CASE 
      WHEN DATENAME(QUARTER, getdate()) = 2 
       THEN DATEADD(qq, DATEDIFF(qq, 0, GETDATE()), 0) 
      END AS FirstDayQuarter 
     ,CASE 
      WHEN DATENAME(QUARTER, getdate()) = 2 
       THEN DATEADD(mm, + 3, DATEADD(dd, - 1, DATEADD(qq, DATEDIFF(qq, 0, GETDATE()), 0))) 
      END AS LasttDayQuarter 
END 
ELSE IF (@Day = '3rdQUARTER') 
BEGIN 
    SELECT CASE 
      WHEN DATENAME(QUARTER, getdate()) + 1 = 3 
       THEN DATEADD(qq, DATEDIFF(qq, 0, GETDATE()) + 1, 0) 
      END AS FirstDayQuarter 
     ,CASE 
      WHEN DATENAME(QUARTER, getdate()) + 1 = 3 
       THEN DATEADD(mm, + 6, DATEADD(dd, - 1, DATEADD(qq, DATEDIFF(qq, 0, GETDATE()), 0))) 
      END AS LasttDayQuarter 
END 
ELSE IF (@Day = '4thQuarter') 
BEGIN 
    SELECT CASE 
      WHEN DATENAME(QUARTER, getdate()) + 2 = 4 
       THEN DATEADD(qq, DATEDIFF(qq, 0, GETDATE()) + 2, 0) 
      END AS FirstDayQuarter 
     ,CASE 
      WHEN DATENAME(QUARTER, getdate()) + 2 = 4 
       THEN DATEADD(mm, + 9, DATEADD(dd, - 1, DATEADD(qq, DATEDIFF(qq, 0, GETDATE()), 0))) 
      END AS LasttDayQuarter 
END 
ELSE 
BEGIN 
    PRINT 'Enter Valid Quarter Name' 
END 

个

输出

FirstDayQuarter  |LasttDayQuarter 
-------------------------------------------- 
2017-01-01 00:00:00.000 |2017-03-31 00:00:00.000