MySQL 中的 NPV 计算

Question

我有一个查询，它根据两个 table 采购数据提供我的成本结构的损益视图。

Select Left(A.Location, 5) as Site, A.Account, A.Category, A.Sub_Category,
sum(If(Month(Inv.Invoice_Date)=1, A.Cost, 0)) as Jan,
sum(If(Month(Inv.Invoice_Date)=2, A.Cost, 0)) as Feb,
sum(If(Month(Inv.Invoice_Date)=3, A.Cost, 0)) as Mar,
sum(If(Month(Inv.Invoice_Date)=4, A.Cost, 0)) as Apr,
sum(If(Month(Inv.Invoice_Date)=5, A.Cost, 0)) as May,
sum(If(Month(Inv.Invoice_Date)=6, A.Cost, 0)) as Jun,
sum(If(Month(Inv.Invoice_Date)=7, A.Cost, 0)) as Jul,
sum(If(Month(Inv.Invoice_Date)=8, A.Cost, 0)) as Aug,
sum(If(Month(Inv.Invoice_Date)=9, A.Cost, 0)) as Sep,
sum(If(Month(Inv.Invoice_Date)=10, A.Cost, 0)) as Oct,
sum(If(Month(Inv.Invoice_Date)=11, A.Cost, 0)) as Nov,
sum(If(Month(Inv.Invoice_Date)=12, A.Cost, 0)) as Dece,
sum(Inv.Cost) as Total,
From Table.A as A
Left join (Select Invoice_Number, Invoice_Line_Number, Invoice_Date, group by Invoice_Number, Invoice_Line_Number) as Inv
on Inv.Invoice_Number = A.Invoice_Number and Inv.Invoice_Line_Number = A.Invoice_Line_Number
Where Left(A.Location_Desc, 5) = 'TEX01'
and Year(Inv.Invoice_Date) = '2016'
Group by Site, Account, Category, Sub_Category
Having Total <> 0
;

到目前为止一切顺利。现在我需要做三件我一直在努力解决的事情：

1) 我需要在每个月列的底部有一个每月总成本行 - 这可能吗？ 2) 我需要在运行查询之前添加我可以修改的变量行。例如，如果我找到一个将成本降低 X 金额的投资机会，我希望能够引入一行，从成本总计中减去该金额以显示节省的金额。 3）我需要计算成本节约投资的净现值。这揭示了另一个问题。查询的结构只提供 1 年的数据，但 NPV 计算需要跨越 5 到 10 年的预测。

最佳查询会平均出网站的成本并用该平均值预测未来的成本 - 然后它会引入通过新投资降低成本的可变行，最后它会执行 NPV 计算以确定是否这项投资值得追求。

我的问题是：

a) MySQL 是正确的工具吗？ b) 我从一个简单的 select 语句中知道这是不可能的——视图语句在这里不起作用，因为我在 Select 语句中有一个子查询。我是否应该构建一个新的 table 来将查询的输出保存为数据并使用该 table 来执行所有这些操作？ c) 我应该研究编程 language/MySQL 解决方案吗？

谢谢！！

Answer 1

对于第一点，您可以通过以下查询获得结果

 Select Left(A.Location, 5) as Site, A.Account, A.Category, A.Sub_Category,
sum(If(Month(Inv.Invoice_Date)=1, A.Cost, 0)) as Jan,
sum(If(Month(Inv.Invoice_Date)=2, A.Cost, 0)) as Feb,
sum(If(Month(Inv.Invoice_Date)=3, A.Cost, 0)) as Mar,
sum(If(Month(Inv.Invoice_Date)=4, A.Cost, 0)) as Apr,
sum(If(Month(Inv.Invoice_Date)=5, A.Cost, 0)) as May,
sum(If(Month(Inv.Invoice_Date)=6, A.Cost, 0)) as Jun,
sum(If(Month(Inv.Invoice_Date)=7, A.Cost, 0)) as Jul,
sum(If(Month(Inv.Invoice_Date)=8, A.Cost, 0)) as Aug,
sum(If(Month(Inv.Invoice_Date)=9, A.Cost, 0)) as Sep,
sum(If(Month(Inv.Invoice_Date)=10, A.Cost, 0)) as Oct,
sum(If(Month(Inv.Invoice_Date)=11, A.Cost, 0)) as Nov,
sum(If(Month(Inv.Invoice_Date)=12, A.Cost, 0)) as Dece,
sum(Inv.Cost) as Total,
From Table.A as A
Left join (Select Invoice_Number, Invoice_Line_Number, Invoice_Date, group by Invoice_Number, Invoice_Line_Number) as Inv
on Inv.Invoice_Number = A.Invoice_Number and Inv.Invoice_Line_Number = A.Invoice_Line_Number
Where Left(A.Location_Desc, 5) = 'TEX01'
and Year(Inv.Invoice_Date) = '2016'
Group by A.Site, A.Account, A.Category, A.Sub_Category with ROLLUP Having Total <> 0 AND 
((a.Site is null or A.Account is not null) and (A.Account is null or A.Category is not null) and (A.Category is null or A.Sub_Category is not null));

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