Question

我正在使用Northwind database在T-SQL中进行一些练习，我应该得到TotalSold / Year SUM（OrderDetails.UnitPrice * OrderDetails.Quantity）对于每家公司，到目前为止我所做的是获得每家公司的TotalSold或获得每笔订单的销售，但不知道如何获得TotalSold / Year。

USE Northwind
GO

SELECT C.CompanyName, O.OrderDate,
   SUM(OD.UnitPrice * OD.Quantity) AS TotalSold
FROM Customers AS C
INNER JOIN Orders AS O
   ON C.CustomerID = O.CustomerID
INNER JOIN [Order Details] AS OD
   ON O.OrderID = OD.OrderID
GROUP BY O.OrderDate, C.CompanyName
GO

结果是

CompanyName         OrderDate                   TotalSold
Alfreds Futterkiste 1997-08-25 00:00:00.000     1086.00
Alfreds Futterkiste 1997-10-03 00:00:00.000     878.00
Alfreds Futterkiste 1997-10-13 00:00:00.000     330.00
Alfreds Futterkiste 1998-01-15 00:00:00.000     851.00
Alfreds Futterkiste 1998-03-16 00:00:00.000     491.20
Alfreds Futterkiste 1998-04-09 00:00:00.000     960.00
...

解决问题的任何想法或线索？

Answer 1

只需使用函数YEAR而不是订单日期本身。

USE Northwind
GO

SELECT C.CompanyName, YEAR(O.OrderDate) AS [Year],
   SUM(OD.UnitPrice * OD.Quantity) AS TotalSold
FROM Customers AS C
INNER JOIN Orders AS O
   ON C.CustomerID = O.CustomerID
INNER JOIN [Order Details] AS OD
   ON O.OrderID = OD.OrderID
GROUP BY YEAR(O.OrderDate), C.CompanyName
GO

如何在Northwind获得TotalSold / Year？

1 个答案: