摘要: 例子 SELECT cust_name,cust_contact FROM Customers,Orders,OrderItems WHERE Customers.cust_id=Orders.cust_id AND OrderItems.order_num=Orders.order_num AND 阅读全文
posted @ 2020-10-19 15:59 猫七的blog 阅读(78) 评论(0) 推荐(0) 编辑