Question

我正在创建一个应用程序，该应用程序应在仪表板中显示一个条形图，显示一个月内第1周到第周周的记录数：

Example (July):
Week 1 (2014-07-01 to 2014-07-05) = 30 records
Week 2 (2014-07-06 to 2014-07-12) = 15 records
Week 3 (2014-07-13 to 2014-07-19) = 50 records
Week 4 (2014-07-20 to 2014-07-26) = 24 records
Week 5 (2014-07-27 to 2014-07-31) = 6 records

我见过几个例子，但他们似乎都关注年度周。如果没有为该周添加记录，则报告应该在本周显示0。我见过的所有例子都使用Group By Date，如果本周有相应的记录，这只会输出一个计数。

Answer 1

尝试以下功能，传递星期几，然后返回周

        CREATE FUNCTION WeeksOfTheMonth(@MothEndDate DATETIME)
        RETURNS
            @DateOfMonth TABLE(
                StartDate DATETIME,
                EndDate DATETIME,
                WeekNo INT
                )

        AS
        BEGIN

        DECLARE @NoOfWeeks AS INT,
                @StartDateNo AS INT,
                @EndDateNo AS INT,
                @Count AS INT

        SELECT 
            @NoOfWeeks = DATEPART(WEEK,DAY(@MothEndDate)), 
            @StartDateNo = 1, 
            @EndDateNo = 5,
            @Count = 1

        WHILE(@NoOfWeeks > 0)
        BEGIN

        INSERT INTO @DateOfMonth(StartDate, EndDate, WeekNo)
        SELECT DATEADD(day, DATEDIFF (day, 1, DATEADD(month, DATEDIFF(month, 0, @MothEndDate), 0) -1) /7*7 + 5, @StartDateNo),
               DATEADD(day, DATEDIFF (day, 1, DATEADD(month, DATEDIFF(month, 0, @MothEndDate), 0) -1) /7*7 + 6, @EndDateNo),
               @Count

         SELECT  
            @StartDateNo = @StartDateNo + 7, 
            @EndDateNo = @EndDateNo + 7, 
            @NoOfWeeks = @NoOfWeeks - 1,
            @Count = @Count + 1
        END
        RETURN
        END

称之为

           SELECT *  FROM WeeksOfTheMonth('31 Aug 2014')

每月报告按周分组在C＃或SQL中

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