當我運行以下SQL代碼時顯示此錯誤？我試圖解決由子查詢

Question

Select c.CustomerName, pl.ProductName as 'Product Name', o.OrderDate as 'Order date', 
Count([Address]) as 'No of Places', SUM(pl.Price * od.OrderQty) as 'Total Amount' 
From Customer c 
Inner Join [Order] o ON o.CustomerId = c.CustomerID 
Inner Join OrderDetails od ON od.OrderId = o.OrderID 
Inner Join ProductList pl ON pl.ProductID = od.ProductId 
where c.CustomerID = (select cc.CustomerID from Customer cc where 
cc.CustomerName = 'Mr.A') 

這個代碼，但顯示該錯誤

消息8120，級別16，狀態1，行 列「Customer.CustomerName」在選擇列表中，因爲無效它不包含在聚合函數或GROUP BY子句中。

Answer 1

你已經忘了指定group by子句，試試這個：

Select c.CustomerName, pl.ProductName as 'Product Name', o.OrderDate as 'Order date', 
Count([Address]) as 'No of Places', SUM(pl.Price * od.OrderQty) as 'Total Amount' 
From Customer c 
Inner Join [Order] o ON o.CustomerId = c.CustomerID 
Inner Join OrderDetails od ON od.OrderId = o.OrderID 
Inner Join ProductList pl ON pl.ProductID = od.ProductId 
Inner join Customer cc on c.CustomerID=cc.CustomerID and cc.CustomerName = 'Mr.A' 
group by c.CustomerName, pl.ProductName, o.OrderDate 

每次使用聚合函數，如時間