Sql MS-Access中的子查询

我需要创建一个SQL语句，该语句将获得以下信息： 多个表中的ISBN、数量、OrderTotal、FirstName、LastName、PhoneNumber和StreetAddress

以下是我迄今为止提出的两个问题，它们为我提供了所需的信息：

客户信息

SELECT c.CustomerID, c.FirstName, c.LastName, c.PhoneNumber, a.StreetAddress
FROM Customers AS c, Address AS a
WHERE c.CustomerID = a.CustomerID;

SELECT o.CustomerID, o.OrderTotal, i.ISBN, i.Quantity
FROM Orders AS o, OrderItems as i
WHERE o.OrderID = i.OrderID;

订单信息

SELECT c.CustomerID, c.FirstName, c.LastName, c.PhoneNumber, a.StreetAddress
FROM Customers AS c, Address AS a
WHERE c.CustomerID = a.CustomerID;

SELECT o.CustomerID, o.OrderTotal, i.ISBN, i.Quantity
FROM Orders AS o, OrderItems as i
WHERE o.OrderID = i.OrderID;

组合查询这不起作用

---

如何将前两个查询合并为一个查询，以提供与第三个查询相同的信息？

在

OrderInfo

中没有

CustomerId

字段。你需要全部三张桌子

SELECT c.FirstName, c.LastName, c.PhoneNumber, c.StreetAddress,
       oi.OrderTotal, oi.ISBN, oi.Quantity
FROM (Customers as c INNER JOIN
      Orders AS o
      ON c.CustomerID = o.CustomerID
     ) INNER JOIN
     OrderItems as oi
     ON o.OrderID = oi.OrderID;

您还需要学习正确的

join

语法和

on

子句。

where

子句中的隐式连接过时，表达能力较差，更容易出错

SELECT c.CustomerID, c.FirstName, c.LastName, c.PhoneNumber, 
a.StreetAddress, 
o.CustomerID, o.OrderTotal, 
i.ISBN, i.Quantity
FROM Customers AS c, Address AS a, Orders AS o, OrderItems as i
WHERE o.OrderID = i.OrderID;
AND c.CustomerID = a.CustomerID
AND c.CustomerID = o.CustomerID;

尝试将其作为一个大查询，而不是两个查询，然后将它们组合起来。这将把您的所有四个表连接在一起。

到底什么“不起作用”？