SQL 服务器 - SELECT 语句未返回结果

Question

使用 AdventureWorks 数据库，我得到了一个问题“列出订单的客户名称、订单状态、订购日期、订单上的商品数量以及平均订购数量，其中订单上的商品数量超过 300”。但是，我下面的 SELECT 语句没有 return 任何结果......我做错了什么？

SELECT scpii.LastName + ', ' + scpii.FirstName AS 'Customer Name', ssoh.Status AS 'Order Status', ssoh.OrderDate AS 'Date Ordered', SUM (ssod.OrderQty) AS 'Count of Items', AVG (ssod.OrderQty) AS 'Average Quantity'
FROM Sales.CustomerPII scpii
INNER JOIN Sales.SalesOrderHeader ssoh
ON ssoh.CustomerID = scpii.CustomerID
INNER JOIN Sales.SalesOrderDetail ssod
ON ssod.SalesOrderID = ssoh.SalesOrderID
GROUP BY scpii.LastName, scpii.FirstName, ssoh.Status, ssoh.OrderDate, ssod.OrderQty
HAVING SUM(ssod.OrderQty) > 300;

Answer 1

您不需要对 ProductID 和 Orderqty 进行分组。如果您对它们进行分组，您将把它分组到一个订单项目级别。所以你永远数不过300
订购商品的数量实际上应该是 Orderqty 的总和。

尝试：

SELECT scpii.LastName + ', ' + scpii.FirstName AS 'Customer Name', 
       ssoh.Status AS 'Order Status', 
       ssoh.OrderDate AS 'Date Ordered', 
       SUM (ssod.OrderQty) AS 'Count of Items', 
       AVG (ssod.OrderQty) AS 'Average Quantity'
FROM Sales.CustomerPII scpii
INNER JOIN Sales.SalesOrderHeader ssoh
  ON ssoh.CustomerID = scpii.CustomerID
INNER JOIN Sales.SalesOrderDetail ssod
  ON ssod.SalesOrderID = ssoh.SalesOrderID
GROUP BY scpii.LastName, 
         scpii.FirstName, 
         ssoh.Status, 
         ssoh.OrderDate 
HAVING SUM (ssod.OrderQty) > 300;

SQL 服务器 - SELECT 语句未返回结果

SQL Server - SELECT statement not returning results

sql

sql-server

adventureworks