Question

我将几乎使用下表和数据，并添加净值，商品及服务税和总值列：

CustomerPO| Net  | GST |  Gross
DS4284735   100    50     150
DS4284735   70     30     100

我的预期结果将是：

CustomerPO| Net  | GST |  Gross
DS4284735   170    80     250

我该如何实现？

我的选择代码是：

SELECT dbo.Invoice.CustomerPO AS Reference, dbo.InvoiceDetails.ExtendedPrice AS Net, dbo.InvoiceDetails.TotalTaxes AS GST, 
                     dbo.InvoiceDetails.ExtendedPrice + dbo.InvoiceDetails.TotalTaxes AS Gross

我是否必须对所有内容进行分组？请注意，这两个数据库表中的InvoiceID有所不同

Answer 1

SELECT ih.CustomerPO AS Reference, 
   sum(id.ExtendedPrice) AS Net, 
   sum(id.TotalTaxes) AS GST, 
   sum(id.ExtendedPrice + id.TotalTaxes) AS Gross
from dbo.Invoice ih
inner join dbo.InvoiceDetails id on ih.InvoiceId = id.InvoiceId
group by ih.CustomerPO;

您只能按非汇总字段CustomerPO分组。

Answer 2

SELECT dbo.Invoice.CustomerPO AS Reference
, ISNULL(dbo.Invoice.CredInvoiceNo, dbo.Invoice.InvoiceNo)
 AS [Invoice Number]
, AVG(dbo.InvoiceDetails.ExtendedPrice) AS Net
, AVG(dbo.InvoiceDetails.TotalTaxes)  AS GST
, CONVERT(int, ROUND(SUM(dbo.InvoiceDetails.ExtendedPrice + dbo.InvoiceDetails.TotalTaxes), 0)) AS Gross
GROUP BY dbo.Invoice.InvoiceNo, dbo.Invoice.CustomerPO, ISNULL(dbo.Invoice.CredInvoiceNo, dbo.Invoice.InvoiceNo), dbo.Invoice.EntryDate

如何在SQL中为每个组选择一行？

2 个答案: