SQL 求和除链接表

Question

我有以下 tables:

create table Cars
(
  CarID int,
  CarType varchar(50),
  PlateNo varchar(20),
  CostCenter varchar(50),
  
);

insert into Cars (CarID, CarType, PlateNo, CostCenter) values 
(1,'Coupe','BC18341','CALIFORNIA'),
(2,'Hatchback','AU14974','DAKOTA'),
(3,'Hatchback','BC49207','NYC'),
(4,'SUV','AU10299','FLORIDA'),
(5,'Coupe','AU32703','NYC'),
(6,'Coupe','BC51719','CALIFORNIA'),
(7,'Hatchback','AU30325','IDAHO'),
(8,'SUV','BC52018','CALIFORNIA');

create table Invoices
(
  InvoiceID int,
  InvoiceDate date,
  CostCenterAssigned bit,
  InvoiceValue money 
);

insert into Invoices (InvoiceID, InvoiceDate, CostCenterAssigned, InvoiceValue) values 
(1, '2021-01-02', 0, 978.32),
(2, '2021-01-15', 1, 168.34),
(3, '2021-02-28', 0, 369.13),
(4, '2021-02-05', 0, 772.81),
(5, '2021-03-18', 1, 469.37),
(6, '2021-03-29', 0, 366.83),
(7, '2021-04-01', 0, 173.48),
(8, '2021-04-19', 1, 267.91);

create table InvoicesCostCenterAllocations
(
  InvoiceID int,
  CarLocation varchar(50)
);

insert into InvoicesCostCenterAllocations (InvoiceID, CarLocation) values 
(2, 'CALIFORNIA'),
(2, 'NYC'),
(5, 'FLORIDA'),
(5, 'NYC'),
(8, 'DAKOTA'),
(8, 'CALIFORNIA'),
(8, 'IDAHO');

如何根据成本中心计算分配给该车的总发票价值？

如果发票分配给特定成本中心的汽车，则 CostCenterAssigned 列设置为 true 并且成本中心列在 InvoicesCostCenterAllocations table 链接到Invoices table 由 InvoiceID 列。如果没有成本中心分配（CostCenterAssigned 列为假），则发票价值除以汽车总数并相加。

Fiddle中的示例数据：http://sqlfiddle.com/#!18/9bd18/3

Answer 1

这里的数据结构并不完美，因此我们需要一些额外的代码来解决这个问题。我需要收集每个位置的汽车数量，并根据发票是否分配到某个位置来分配每张发票的金额。我列出了每种发票类型的总计，以便您可以看到放在一起的组件，最终结果中不需要这些组件。

;WITH CarsByLocation AS(    
    SELECT  
         CostCenter
        ,COUNT(*) AS Cars
    FROM Cars 
    GROUP BY CostCenter
    UNION ALL
    SELECT  
         ''
        ,COUNT(*) AS Cars
    FROM Cars   
),CostCenterAssignedInvoices AS (
    SELECT 
         InvoicesCostCenterAllocations.CarLocation
        ,SUM(invoicevalue) / CarsByLocation.cars AS InvoiceTotal
    FROM Invoices 
    INNER JOIN InvoicesCostCenterAllocations ON invoices.InvoiceID = InvoicesCostCenterAllocations.InvoiceID
    INNER JOIN CarsByLocation on InvoicesCostCenterAllocations.CarLocation = CarsByLocation.CostCenter
    WHERE CostCenterAssigned = 1  --Not needed, put here for clarification
    GROUP BY InvoicesCostCenterAllocations.CarLocation,CarsByLocation.Cars
),UnassignedInvoices AS (
    SELECT 
         '' AS Carlocation
        ,SUM(invoicevalue)/CarsByLocation.Cars InvoiceTotal
    FROM Invoices 
    INNER JOIN CarsByLocation on CarsByLocation.CostCenter = ''
    WHERE CostCenterAssigned = 0
    group by CarsByLocation.Cars
)
SELECT 
      Cars.*
     ,cca.InvoiceTotal AS AssignedTotal
     ,ui.InvoiceTotal AS UnassignedTotal
     ,cca.InvoiceTotal + ui.InvoiceTotal AS Total
FROM Cars 
LEFT OUTER JOIN CostCenterAssignedInvoices CCA ON Cars.CostCenter = CCA.CarLocation
LEFT OUTER JOIN UnassignedInvoices UI ON UI.Carlocation = ''
ORDER BY 
     Cars.CostCenter
    ,Cars.PlateNo;

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