确定月份的天数返回3月份的不同计数

Question

这对你们所有人都很奇怪。

我需要确定一个月内的天数

  ;WITH cteNetProfit AS 
(
   ---- NET PROFIT
    SELECT DT.CreateDate
        , SUM(DT.Revenue) as Revenue
        , SUM(DT.Cost)  as Cost
        , SUM(DT.GROSSPROFIT) AS GROSSPROFIT
        FROM
    (
        SELECT   CAST([createDTG] AS DATE) as CreateDate
             ,   SUM(Revenue) as Revenue
             ,   SUM(Cost)  as Cost
             ,   SUM(REVENUE - COST) AS GROSSPROFIT
        FROM [dbo].[CostRevenueSpecific]
        WHERE   CAST([createDTG] AS DATE) > CAST(GETDATE() - 91 AS DATE)
            AND CAST([createDTG] AS DATE) <= CAST(GETDATE() - 1 AS DATE)
        GROUP BY createDTG
        UNION ALL
        SELECT  CAST([CallDate] AS DATE) AS CreateDate
                ,   SUM(Revenue) as Revenue
                ,   SUM(Cost)   as Cost
                ,   SUM(REVENUE - COST) AS GROSSPROFIT
        FROM abc.PublisherCallByDay
        WHERE   CAST([CallDate] AS DATE) > CAST(GETDATE() - 91 AS DATE)
            AND CAST([CallDate] AS DATE) <= CAST(GETDATE() - 1 AS DATE)
        GROUP BY CALLDATE
    ) DT
    GROUP BY DT.CreateDate 
)
 select distinct MONTH(CREATEDATE), DateDiff(Day,CreateDate,DateAdd(month,1,CreateDate))
FROM cteNetProfit

由于某种原因，它返回2016年3月份的两个不同结果，一个结果是30，另一个结果是31（当然是正确的）我验证基础数据只有31天的数据游行。由于2月是闰年，这会影响DATEDIFF功能。剩下的几个月会返回正确的＃。

2   29
3   31
3   30
4   30
5   31

Answer 1

当您达到2016-03-31日期时，差异就会出现。如果您在2016-03-30和2016-03-31运行以下查询，则在两个实例中使用DATEADD添加1个月的结果为2016-04-30。它返回下个月的最后一天。

SELECT DATEADD(MONTH,1,'2016-03-30') , DATEADD(MONTH,1,'2016-03-31')

这种语法似乎有效（由https://raresql.com/2013/01/06/sql-server-get-number-of-days-in-month/提供）。

SELECT DAY(DATEADD(ms,-2,DATEADD(MONTH, DATEDIFF(MONTH,0,@DATE)+1,0))) AS [Current Month]

Answer 2

感谢您的投入，但我在其他地方找到了解决方案

select Distinct MONTH(CREATEDATE), Day(EOMONTH(CreateDate))
FROM cteNetProfit