Question

好的，我已经仔细阅读了这个网站，这里有一些成员建议，sql教科书等。问题：列出客户名称，订单日期，订购数量，报价，开票金额以及从Premiere Products订购的商品的描述。按订单日期使用客户名称组织此报告表格：

SQL> desc customer
 Name
 ----------------------
 CUSTOMER_NUM
 CUSTOMER_NAME
 STREET
 CITY
 STATE
 ZIP
 BALANCE
 CREDIT_LIMIT
 REP_NUM

SQL> desc orders
 Name
 ----------------------
 ORDER_NUM
 ORDER_DATE
 CUSTOMER_NUM

SQL> desc order_line
 Name
 ----------------------
 ORDER_NUM
 PART_NUM
 NUM_ORDERED
 QUOTED_PRICE

SQL> desc part
 Name
 ----------------------
 PART_NUM
 DESCRIPT
 ON_HAND
 CLASS
 WAREHOUSE
 PRICE

以下是我用于查询的内容：

SQL>  SELECT CUSTOMER.CUSTOMER_NAME, ORDERS.ORDER_DATE,
  2   ORDER_LINE.NUM_ORDERED, ORDER_LINE.QUOTED_PRICE,
  3   SUM(Num_Ordered*Quoted_Price) AS Amt_Billed,
  4   PART.DESCRIPT
  5   FROM customer
  6   INNER JOIN CUSTOMER INNER JOIN ORDERS ON
             CUSTOMER.CUSTOMER_NUM =ORDERS.CUSTOMER_NUM
  7   INNER JOIN ORDER_LINE ON ORDERS.ORDER_NUM = ORDER_LINE.ORDER_NUM
  8   Inner JOIN ORDER_LINE ON PART.PART_NUM = ORDER_LINE.PART_NUM;
 Inner JOIN ORDER_LINE ON PART.PART_NUM = ORDER_LINE.PART_NUM
                                                            *
ERROR at line 8:
ORA-00905: missing keyword

我已经尝试了好几次，甚至为它创建了一个访问表，而且SQL与我在这里的基本相同。我正在使用Oracle 11g。

Answer 1

尝试

    SQL>  SELECT CUSTOMER.CUSTOMER_NAME, ORDERS.ORDER_DATE,
   ORDER_LINE.NUM_ORDERED, ORDER_LINE.QUOTED_PRICE,
   SUM(Num_Ordered*Quoted_Price) AS Amt_Billed,
   PART.DESCRIPT
   FROM customer
   INNER JOIN ORDERS ON CUSTOMER.CUSTOMER_NUM =ORDERS.CUSTOMER_NUM
   INNER JOIN ORDER_LINE ON ORDERS.ORDER_NUM = ORDER_LINE.ORDER_NUM
   Inner JOIN PART ON PART.PART_NUM = ORDER_LINE.PART_NUM;

第6行是不正确的JOIN声明

第8行正在加入错误的表格

Answer 2

Yeap，再次加入：）

INNER JOIN CUSTOMER INNER JOIN ORDERS ON

您错过了ON中的CUSTOMER，或者您有额外的INNER JOIN CUSTOMER。很可能是第二个。

Answer 3

获取SQL格式有助于遵循表之间的关系。注意我的简化缩进并显示连接到右侧的左侧表，而ON子句显示它们之间的列式关系。

一旦完成，然后获取其余列以供选择，求和，分组依据，顺序等等

SELECT
      c.customer_name,
      o.order_date,
      ol.num_ordered,
      ol.quoted_price,
      ol.num_ordered * ol.quoted_price as amt_Billed,
      p.descript
   from
      customer c
         join orders o
            ON c.customer_num = o.customer_num
            join order_line ol
               ON o.order_num = ol.order_num
               join part p
                  ON ol.part_num = p.part_num
   order by
      o.order_date,
      c.customer_name

由于您的查询显示了订购商品的每个订单项的金额，因此您不需要“SUM（）”，您可以将列直接乘以每行总金额，因为您显示的是实际订购的每个零件。

还要注意每个表的简化别名引用和重复写入每个表名的全长。

我究竟做错了什么？再加入？

3 个答案: