如何计算日期和时间因素的累计总数?

时间:2016-04-26 20:47:37

标签: tsql date sum sql-server-2014-express totals

我被要求创建一个存储过程,显示可变日期范围内的租赁项目数量。我有一个包含以下架构的表:

         --Note that this is condensed, and in reality has proper    constraints
        --and more columns. Many dates from this table are tied to a single
        --ContractDetail (separate table) by ContractDetailId.
        CREATE TABLE RentalContractDates
        (
            RentalDateId               INT IDENTITY(1,1)    NOT NULL, --PK
            ContractDetailId           INT                  NOT NULL, --FK
            RentalDate                 DATETIME             NOT NULL,
            Quantity                   DECIMAL(20,8)        NULL
        );

        INSERT INTO RentalContractDates (ContractDetailId, RentalDate, Quantity)
        VALUES (1, '04/01/2016 3:00 PM', 10), 
               (1, '04/10/2016 1:00 PM', 2), 
               (1, '04/15/2016 11:00 AM', -5),
               (1, '04/15/2016 11:30 AM', -2), 
               (1, '04/27/2016 2:00 PM', -5);       

用户将输入要搜索的日期范围,并且该程序应查找属于此范围内的所有日期,然后还计算截止时间,以便客户在其租赁的另一天收取费用。

示例场景:全局截止时间设置为12:00 PM。我有2016年4月1日下午3:00租用的10个小工具。这基本上我的意思是我实际上是在2016年4月2日租用它们,因为它已经过了04/01的截止时间。我在2016年4月4日下午1:00再租2个,所以基本上是4/11/2016。我在2016年4月15日上午11:00返回5个小部件,在上午11:30返回2个小部件。我想在2016年4月27日退回所有小部件,但是我到达截止时间中午12:00,所以我实际上将收取4/02的费用,而不是4 / 02-4 / 27的费用。 -4/28。

重要提示:如果我之前在04/01之前租用了数量,这是报告范围的开头,我需要在报告中包含这些数量。例如,如果我在3/31,4/1和12上有12个租金,那么他们的总数将增加12个。换句话说,任何先前的数量都需要计算到输入报告@BeginDate和@EndDate参数的总和中。 所以04/01将会读到12,04 / 02会读22等等。

正如您所看到的,我不需要用户每天输入他们的租金,我只是让他们设置一个数量的租金的开始日期和时间,下次他们输入日期/时间组合时,它会重新总结。

当前代码:我想将此查询与整个月份的日历日期列表相关联,并相应地设置其数量。

        DECLARE @BeginDate DATETIME = '04/01/2016',
                @EndDate DATETIME = '04/28/2016';

        DECLARE
                @CutoffTime TIME = '12:00 PM';

        SET @BeginDate = @BeginDate + @CutoffTime;
        SET @EndDate = @EndDate + @CutoffTime;

        SELECT  gbd.ContractDetailId,
                gbd.RentalDate,
                gbd.Cutoff,
                gbd.Quantity,
                'Running Total' = SUM(Quantity) OVER (PARTITION BY ContractDetailId, RentalDate, Cutoff ORDER BY RentalDate)
        FROM    (

    SELECT  
            r.ContractDetailId,
            'RentalDate' = CONVERT(Date, RentalDate),
            r2.Cutoff,
            r.Quantity
    FROM    RentalContractDates r
    INNER JOIN
        (
            SELECT 
                rcd.ContractDetailId,
                'Cutoff' = CASE WHEN CONVERT(TIME, RentalDate) >= @CutoffTime THEN 'AFTER CUTOFF' ELSE 'BEFORE CUTOFF' END
            FROM 
                RentalContractDates rcd
         ) r2
        ON r2.ContractDetailId = r.ContractDetailId
    WHERE  
            r.RentalDate Between @BeginDate and @EndDate
    GROUP BY r.ContractDetailId, CONVERT(DATE, RentalDate), r2.Cutoff, Quantity
        ) gbd
        ORDER BY RentalDate, Cutoff DESC

我想将此数据加入此CTE并为每个日期设置数量:

        ;WITH T([Date]) AS
    ( 
        SELECT @StartDate
        UNION ALL
        SELECT DATEADD(DAY,1,T.[Date]) FROM T WHERE T.[Date] < @EndDate
    )
    SELECT * FROM T

预期的最终结果: 完成后,报告最终会看起来像这样,虽然它将被转动并包含名称中的星期几:

    ContractDetailId    RentalDate      Quantity
      ----------------------------------------------------------------
        1               04/01/2016        0  -- 0, because rentals were input after cutoff.
        1               04/02/2016        10
        1               04/03/2016        10 -- Continues until 4/10
        1               04/10/2016        10
        1               04/11/2016        12 -- Continues until 4/15
        1               04/15/2016        5  -- I returned 5 and then 2, so this should sum since both were before the cutoff time.
                                             -- Continues until 4/27.
        1               04/27/2016        5  -- 5, because -5 was entered past cutoff on 4/27.
        1               04/28/2016        0                   

我有旋转代码以及最终输出所需的动态sql已经完成(如果需要,我可以发布这个),但我对如何通过预截止/截止后正确分组这些数据感到迷茫,并改变了相应的一天。我该如何处理这种情况?感谢您的任何建议/帮助!

修改1:修正了不正确的样本数据。

1 个答案:

答案 0 :(得分:0)

  --Inputs for your function
    DECLARE @BeginDate DATE = '04/01/2016',
            @EndDate DATE = '04/28/2016',
            @ContractDetailID INT = 1;

    --Defined in the function
    DECLARE @CutoffTime TIME = '12:00 PM';

    DECLARE @PriorSum DECIMAL(20,8) = 0;

    DECLARE @RowCount INT = DATEDIFF(dd,@BeginDate,@Enddate) +1;

    --Get Any quantities before Begin Date
    SELECT @PriorSum=COALESCE(SUM(rcd.Quantity),0)
    from RentalContractDates rcd
    WHERE CAST(CASE when CAST(rcd.RentalDate as TIME) > @CutoffTime THEN DATEADD(dd,1,rcd.RentalDate) ELSE rcd.RentalDate end as date) < @BeginDate
        AND @ContractDetailID = rcd.ContractDetailId

    --Create the Days for the report
    ;WITH RecursiveRowGenerator (Row#, Iteration) AS (
           SELECT 1, 1
            UNION ALL
           SELECT Row# + Iteration, Iteration * 2
             FROM RecursiveRowGenerator
            WHERE Iteration * 2 < CEILING(SQRT(@RowCount+1))
            UNION ALL
           SELECT Row# + (Iteration * 2), Iteration * 2
             FROM RecursiveRowGenerator
            WHERE Iteration * 2 < CEILING(SQRT(@RowCount+1))
         )
         , SqrtNRows AS (
           SELECT *
             FROM RecursiveRowGenerator
            UNION ALL
           SELECT 0, 0
         )
         , Rowtbl as (  
           SELECT top (@RowCount+1) A.Row# * POWER(2,CEILING(LOG(SQRT(@RowCount+1))/LOG(2))) + B.Row# as RowNum
           FROM SqrtNRows A, SqrtNRows B
           ORDER BY A.Row#, B.Row#
         )  
      ,
    DateTable as (

      select top (@RowCount)  DATEADD(dd,RowNum,@BeginDate) AS ReportDate
      from Rowtbl
      where RowNum <= @RowCount  

      )
    ,
    --Merge the days for the report with the actual rental data
    GBD AS 
    ( SELECT  
               @ContractDetailID as ContractDetailID,
                DT.ReportDate AS 'RentalDate',
                CASE when CAST(rcd.RentalDate as TIME) > @CutoffTime THEN 'AFTER CUTOFF' ELSE 'BEFORE CUTOFF' END AS 'Cutoff',
                COALESCE(rcd.Quantity,0) AS Quantity
        FROM    DateTable DT 
        LEFT JOIN RentalContractDates rcd on 
                DT.ReportDate = CAST( CASE when CAST(rcd.RentalDate as TIME) > @CutoffTime THEN DATEADD(dd,1,rcd.RentalDate) ELSE rcd.RentalDate END as DATE) 
                AND @ContractDetailID = rcd.ContractDetailId
        WHERE DT.ReportDate Between @BeginDate and @EndDate 


    )
--Final Select    
SELECT  gbd1.ContractDetailId,
                gbd1.RentalDate,
                (select SUM(gbd2.Quantity) from GBD GBD2 where GBD1.rentaldate >= GBD2.RentalDate) + @PriorSum AS RunningTotal               
        FROM   GBD gbd1     
        GROUP BY gbd1.ContractDetailId,gbd1.RentalDate
        ORDER BY gbd1.RentalDate asc   

编辑: 递归行生成器是由Aaron Friel创建的,是我用于生成行t-sql select get all Months within a range of years的解决方案。它为所有日期生成行,因此如果没有该日期的记录,我们可以将数量加0或0。使用此生成器,从2000年到2016年生成日期非常便宜。将所有数量和之前的金额加入到那些日期是相当昂贵的。将它们聚合在一起,即使对于没有在RentalContractDates中记录的日期,您也有一个运行总计是昂贵的部分。

处理截止时间问题的部分是:

gbd.RentalDate = CAST(CASE WHEN CAST(rcd.RentalDate AS TIME) > @CutoffTime THEN DATEADD(dd, 1, rcd.RentalDate)
            ELSE rcd.RentalDate END AS DATE)

它将rentaldate转换为仅限时间,与cutoffTime进行比较,如果过去则添加一天,然后仅转换为日期。