使用Oracle的子查询

我已经在这个问题上工作了大约8个小时，但没有成功。有人有什么想法吗

问题: 使用正确的表，使用希望的联接操作创建一个子查询，该操作将列出订购最昂贵书籍（基于零售价）的所有客户的客户编号、连在一起的名字和姓氏以及所在城市。给出“客户名称”的组合客户名称列和别名

这是我的密码：

SELECT book_customer.customerid, lastname || ', ' || firstname AS "Customer Name", city
FROM book_customer, book_order, order_items 
    WHERE book_customer.customerid = book_order.customerid
        AND book_order.orderid = order_items.orderid
            AND bookid =
            (
            SELECT MAX(retail) 
                FROM books 
                    GROUP BY bookid
            )
;

结果:

 SQL> SELECT book_customer.customerid, lastname || ', ' || firstname AS "Customer Name", city
  2   FROM book_customer, book_order, order_items 
  3    WHERE book_customer.customerid = book_order.customerid
  4     AND book_order.orderid = order_items.orderid
  5      AND bookid =
  6      (
  7      SELECT MAX(retail) 
  8       FROM books 
  9        GROUP BY bookid
 10      )
 11  ;
    SELECT MAX(retail)
    *
ERROR at line 7:
ORA-01427: single-row subquery returns more than one row

  SQL> SELECT customerid, lastname || ', ' || fistname AS "Customer Name", city
  2   FROM book_customer, book_order
  3    WHERE book_customer.customerid = book_order.customerid
  4      AND orderid = 
  5      (
  6      SELECT orderid
  7       FROM order_items
  8         AND bookid =
  9          (
 10          SELECT bookid
 11            FROM books
 12              GROUP BY bookid
 13                HAVING MAX(retail)
 14           )
 15      )
 16  ;
       AND bookid =
       *
ERROR at line 8:
ORA-00907: missing right parenthesis

我也试过：

SELECT customerid, lastname || ', ' || fistname AS "Customer Name", city
FROM book_customer, book_order
    WHERE book_customer.customerid = book_order.customerid
        AND orderid = 
        (
        SELECT orderid
            FROM order_items
                AND bookid =
                 (
                 SELECT bookin
                    FROM books
                        GROUP BY bookid
                            HAVING MAX(retail)
                  )
        )
;

结果:

 SQL> SELECT book_customer.customerid, lastname || ', ' || firstname AS "Customer Name", city
  2   FROM book_customer, book_order, order_items 
  3    WHERE book_customer.customerid = book_order.customerid
  4     AND book_order.orderid = order_items.orderid
  5      AND bookid =
  6      (
  7      SELECT MAX(retail) 
  8       FROM books 
  9        GROUP BY bookid
 10      )
 11  ;
    SELECT MAX(retail)
    *
ERROR at line 7:
ORA-01427: single-row subquery returns more than one row

  SQL> SELECT customerid, lastname || ', ' || fistname AS "Customer Name", city
  2   FROM book_customer, book_order
  3    WHERE book_customer.customerid = book_order.customerid
  4      AND orderid = 
  5      (
  6      SELECT orderid
  7       FROM order_items
  8         AND bookid =
  9          (
 10          SELECT bookid
 11            FROM books
 12              GROUP BY bookid
 13                HAVING MAX(retail)
 14           )
 15      )
 16  ;
       AND bookid =
       *
ERROR at line 8:
ORA-00907: missing right parenthesis

ERD

任何帮助都将不胜感激。

试试这个：

SELECT
Book_Customer.CustomerID, 
Book_Customer.lastname || ', ' || Book_Customer.firstname AS "Customer Name", 
Book_Customer.city
FROM Order_Items 
JOIN Book_Order ON Order_Items.OrderID = Book_Order.OrderID
JOIN Book_Customer ON Book_Customer.CustomerID = Book_Order.CustomerID
JOIN Books ON Books.BookID = Order_Items.BookID
WHERE Books.Retail = (SELECT MAX(Retail) FROM Books)

---

你需要把任务分解

第一步是确定你在看哪本书，比如：

Select BookID from books where RowNum=1 order by retail desc

这实际上成为了您的子查询，您可以在连接中使用它来收集所需的数据

---

我可以帮你解决整个问题，但这并不能教会你任何东西——这些东西总是很精细，只有通过精细操作，你才能学会……

对于第一个错误，请尝试下面的查询

 SQL> SELECT bc.customerid, lastname || ', ' || firstname AS "Customer Name", city
2   FROM book_customer bc, book_order bo, order_items  oi
3    WHERE book_customer.customerid = book_order.customerid
4     AND book_order.orderid = order_items.orderid
5      AND bookid =
6       (
 7      SELECT MAX(retail) 
 8       FROM books 
 9        GROUP BY bookid
10      )

请在查询中提供tablename.column名称，因为同一列可以存在于查询中使用的多个表中。我可以看到CustomerId存在于多个表中。你也可以使用别名。就像我上面所做的

对于第二个问题，我提供了存在错误的注释：-

SELECT customerid, lastname || ', ' || fistname AS "Customer Name", city
2   FROM book_customer, book_order
 3    WHERE book_customer.customerid = book_order.customerid
 4      AND orderid = 
 5      (
 6      SELECT orderid
7       FROM order_items
8         AND bookid =--no where caluse here it should be WHERE bookid=
9          (
10          SELECT bookin
 11            FROM books
 12              GROUP BY bookid
 13                HAVING MAX(retail)
   14           )
 15      )

试试这个

 SELECT a.customerid, a.lastname || ', ' || a.firstname AS Customer_Name, a.city
   FROM book_customer a, 
        book_order b, 
        order_items c 
  WHERE a.customerid = b.customerid
   AND b.orderid = c.orderid
   AND c.bookid =
 (
      SELECT MAX(retail) 
        FROM books 
      GROUP BY bookid
 );

---

在第二个示例中，lastname处有一个逗号，| |-请尝试将其删除。谢谢，但仍然存在问题。是否愿意分享新错误第一条错误消息非常明显：表中有多个列名为“customerid”，因此您必须显式指出您想要哪个“customerid”。谢谢，没有注意到这一点。很抱歉，我没有你那么有经验，但感谢你指出显而易见的问题。感谢你的反馈。许多其他答案可以返回多本书的数据（如果多本书共享最高零售价）。我不确定，因为你已经被告知使用子查询和联接，这就是你的导师将要寻找的…相信我，我已经摆弄过了。谢谢你的反馈。谢谢你的反馈。这很有效！谢谢当服务器重新启动时，我将尝试使用我试图用于将来参考的连接，看看是否可以让它正常工作。谢谢你的帮助！我对编辑的不满，我有点累（我已经做了14个小时了），我想这就是你更新进度的方式。