涉及连接的SQL查询

Question

对于SQL评估，我必须执行一个查询，我需要按销售员代码的顺序列出过去一个月的汽车销售情况。 我已经创建了一条SQL语句。但是，当我运行它时，除了查询中包含的列名称外，它什么都没有列出。我已经使用了SQL代码如下：

SELECT CarForSale.SalesmanCode, 
    Salesman.SalesmanName, 
    Customer.CustomerCode, 
    Customer.CustomerName, 
    Customer.CustomerAddress 
FROM 
(
    Centre 
    INNER JOIN Customer 
    ON Centre.CentreCode = Customer.CentreCode 
) 
INNER JOIN CarForSale 
    ON (Customer.CustomerCode = CarForSale.CustomerCode) 
    AND (Centre.CentreCode = CarForSale.CentreCode), Salesman 
WHERE CarForSale.CFSSoldDate BETWEEN CVDATE('01/02/2013') AND CVDATE('01/03/2013') 
ORDER BY Salesman.SalesmanCode; 

如果任何人有任何意见或知道我要去的地方错了，我将非常感激这个问题的一些援助。

这里是作为请求的一些示例数据：

• CFS表

  CFSCode CFSMake CFSModel CFSSellingPrice 
  000001 Mercedes W168   45000    
  
  CFSSoldDate CentreCode SalesmanCode CustomerCode 
  01/03/2013 00000001 0000000001 00000001 
  

• 推销员表

  SalesmanCode SalesmanName SalemanCommThisYear SalesmanStatus CentreCode 
  0000000001 Liam Jones  2250   senior  00000001 
  

• 客户表

  CustomerCode CustomerName CustomerAddress CentreCode CustomerStatus 
  00000001 Gina Smith  1, The Lake,  00000002   good 
            Merthyr Tydfil 
  

Answer 1

在你当前的查询，你有一些不寻常的语法：

AND (Centre.CentreCode = CarForSale.CentreCode), Salesman -- what's this 

我不知道什么是, Salesman应该做的。但是，如果你试图JOIN在Salesman表，然后将查询将是：

SELECT CarForSale.SalesmanCode, 
    Salesman.SalesmanName, 
    Customer.CustomerCode, 
    Customer.CustomerName, 
    Customer.CustomerAddress 
FROM ((Centre 
INNER JOIN Customer 
    ON Centre.CentreCode = Customer.CentreCode) 
INNER JOIN CarForSale 
    ON (Customer.CustomerCode = CarForSale.CustomerCode) 
    AND (Centre.CentreCode = CarForSale.CentreCode))) 
INNER JOIN Salesman 
    ON CarForSale.SalesmanCode = Salesman.SalesmanCode 
WHERE CarForSale.CFSSoldDate BETWEEN #01/02/2013# AND #01/03/2013# 
ORDER BY Salesman.SalesmanCode; 

在MS Access

而且，使用的日期时，应通过磅SIGS #包围。您的查询应该是：

SELECT CarForSale.SalesmanCode, 
    Salesman.SalesmanName, 
    Customer.CustomerCode, 
    Customer.CustomerName, 
    Customer.CustomerAddress 
FROM ((Centre 
INNER JOIN Customer 
    ON Centre.CentreCode = Customer.CentreCode) 
INNER JOIN CarForSale 
    ON (Customer.CustomerCode = CarForSale.CustomerCode) 
    AND (Centre.CentreCode = CarForSale.CentreCode))) 
INNER JOIN Salesman 
    ON CarForSale.SalesmanCode = Salesman.SalesmanCode 
WHERE CarForSale.CFSSoldDate BETWEEN #01/02/2013# AND #01/03/2013# 
ORDER BY Salesman.SalesmanCode; 

编辑＃1，我不知道你为什么在Centre表，因为你不使用它的任何东西的加盟。我只是使用您的示例数据在MS Access中运行以下查询并获得结果：

SELECT CarForSale.SalesmanCode, 
    Salesman.SalesmanName, 
    Customer.CustomerCode, 
    Customer.CustomerName, 
    Customer.CustomerAddress 
FROM (Customer 
INNER JOIN CarForSale 
    ON Customer.CustomerCode = CarForSale.CustomerCode) 
INNER JOIN Salesman 
    ON CarForSale.SalesmanCode = Salesman.SalesmanCode 
WHERE CarForSale.CFSSoldDate BETWEEN #01/02/2013# AND #01/03/2013# 
ORDER BY Salesman.SalesmanCode;