SQL服务器的动态情况当

我有这个疑问SQL服务器的动态情况当

SELECT 
    Product, Description, 
    Sum(CASE WHEN Datum = ’01.2011’ THEN [A_Sales] END) AS [A_salesFeb], 
    Sum(CASE WHEN Datum = ’05.2011’ THEN [A_Sales] END) AS [A_salesMay], 
    Sum(CASE WHEN Datum = ’01.2011’ THEN [B_Sales] END) AS [B_salesFeb], 
    Sum(CASE WHEN Datum = ’05.2011’ THEN [B_Sales] END) AS [B_salesMay], 
FROM tblSales 
GROUP BY Product, Description

现在我需要让动态的水平基准=“”，工作正常。现在说我现在有08.2012和04.2013 它应该通过并进行匹配。因此，我将其更改为以下查询，但它不起作用。我得到错误的数字

SELECT 
    Product, Description, 
    Sum(CASE WHEN Datum = Datum THEN [A_Sales] END) AS [A_salesFeb], 
    Sum(CASE WHEN Datum = Datum THEN [A_Sales] END) AS [A_salesMay], 
    Sum(CASE WHEN Datum = Datum THEN [B_Sales] END) AS [B_salesFeb], 
    Sum(CASE WHEN Datum = Datum THEN [B_Sales] END) AS [B_salesMay], 
FROM tblSales 
GROUP BY Product, Description

数据采集：我有12桌，我希望用户能够选择任意两个表动态/或者，然后做一个comparisim。我现在拥有的是静态的。事情是这样的： Sample data

来源

2015-05-07 James

添加一些样本数据，并告诉我们更多的不是“它不工作”。 –

如果您可以提供一些具有所需输出的样本数据，这将是可以解决的。 – Tanner

编辑问题 – James

基于该数据，并在您的示例数据所需的结果集 - 这是查询我会写：

select Datum, Product, sum(FebSales13.A_sales) as A_SalesFeb, 
sum(FebSales13.B_sales) as B_SalesFeb, sum(MaySales12.A_sales) as A_SalesMay, 
sum(MaySales12.B_sales) as B_SalesMay 
from 
    (select Datum, Product, A_sales, B_sales 
    from FebSales13) FebSales13 
inner join 
    (select Datum, Product, A_sales, B_sales 
    from MaySales13) MaySales13 
on FebSales13.Datum = MaySales12.Datum 
and FebSales13.Product = MaySales12.Product 
group by Datum, Product

来源

2015-05-07 16:45:30 tember

SQL服务器的动态情况当

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