Question

我想看看前10位客户，这是我到目前为止所做的，我做错了什么？

CREATE VIEW vwTopCustomer
AS 
   SELECT TOP 10 * 
       (CustomerID) AS TotalMoneySpent, 
       SUM(Quantity*Price)
   FROM 
       tblCUSTOMER c
   JOIN 
       tblORDER o ON c.CustomerID = o.CustomerID
   JOIN 
       tblORDER_PRODUCT op ON o.OrderID = op.OrderID
   JOIN 
       tblPRODUCT p ON op.ProductID = p.ProductID
   GROUP BY  
       CustomerID
   ORDER BY 
       TotalMoneySpent DESC
   GO

Answer 1

您不能group by一列，然后在查询结果中Select *。

试试这个编辑过的版本..

CREATE VIEW vwTopCustomer
AS 
   SELECT TOP 10 
       (CustomerID), 
       SUM(Quantity*Price) AS TotalMoneySpent
   FROM 
       tblCUSTOMER c
   JOIN 
       tblORDER o ON c.CustomerID = o.CustomerID
   JOIN 
       tblORDER_PRODUCT op ON o.OrderID = op.OrderID
   JOIN 
       tblPRODUCT p ON op.ProductID = p.ProductID
   GROUP BY  
       CustomerID
   ORDER BY 
       2 DESC
   GO

Answer 2

在没有看到数据的情况下，我无法确定，但我注意到的两件事是你选择了前10个*然后是两个字段。此外，第二列可能是您要通过desc订购的。

CREATE VIEW vwTopCustomer
AS 
   SELECT TOP 10 
       CustomerID , 
       SUM(Quantity*Price) AS TotalMoneySpent
   FROM 
       tblCUSTOMER c
   JOIN 
       tblORDER o ON c.CustomerID = o.CustomerID
   JOIN 
       tblORDER_PRODUCT op ON o.OrderID = op.OrderID
   JOIN 
       tblPRODUCT p ON op.ProductID = p.ProductID
   GROUP BY  
       CustomerID
   ORDER BY 
       TotalMoneySpent DESC
   GO

Answer 3

请注意，SQL Server将获得TOP 10行，但可能会或可能不会按照您希望显示的顺序显示。

这是sql server的限制。返回的行将是＆＃34;更正＆＃34; TOP 10但不按预期的ORDER BY子句的顺序排列。

从视图中进行选择时，您需要使用ORDER BY子句。

CREATE VIEW vwTopCustomer
AS 
   SELECT TOP 10  CustomerID 
             ,SUM(Quantity*Price) AS TotalMoneySpent
   FROM  tblCUSTOMER c
   JOIN  tblORDER o          ON c.CustomerID = o.CustomerID
   JOIN  tblORDER_PRODUCT op ON o.OrderID = op.OrderID
   JOIN  tblPRODUCT p        ON op.ProductID = p.ProductID
   GROUP BY   CustomerID
   ORDER BY  TotalMoneySpent DESC
GO

从视图中选择

SELECT * FROM vwTopCustomer
ORDER BY TotalMoneySpent DESC

视图中的ORDER BY

按指定的列列表排序查询的结果集，并且（可选）将返回的行限制为指定范围。订单中除非是，否则不保证在结果集中返回哪些行指定了ORDER BY子句。

BOL Referrence

查询顶级客户的SQL查询

3 个答案: