sql - Oracle SQL 错误 ORA-00933：SQL 命令未正确结束

Question

这个查询有什么问题？

SELECT F.PART_NUM, F.DESCRIPTION, S.PART_NUM, S.DESCRIPTION, F.CLASS 
FROM PART F, PART S 
WHERE F.CLASS = S.CLASS AND F.PART_NUM < customer_num =" ORDERS.CUSTOMER_NUM" 
customer_name =" 'Johnson''s"> SELECT ORDERS.ORDER_NUM, ORDER_DATE
FROM ORDERS, ORDER_LINE, PART
WHERE ORDERS.ORDER_NUM = ORDER_LINE.ORDER_NUM
AND ORDER_LINE.PART_NUM = PART.PART_NUM
AND DESCRIPTION = 'Iron';

Answer 1

很难为表结构提供正确答案以及您尝试实现的业务逻辑的解释，但我认为您想要这样的东西：

SELECT F.PART_NUM, F.DESCRIPTION, S.PART_NUM, S.DESCRIPTION, F.CLASS 
FROM PART F, PART S 
     , ( SELECT customer_num
               , customer_name
               , order_line.part_num
        FROM ORDERS, ORDER_LINE 
        WHERE ORDERS.ORDER_NUM = ORDER_LINE.ORDER_NUM ) o
WHERE F.CLASS = S.CLASS 
AND F.PART_NUM < o.customer_num 
and o.customer_name ='Johnson''s'
AND o.PART_NUM = PART.PART_NUM
AND DESCRIPTION = 'Iron';