标签：bsp ons ble add constrain 主键 一个 const 另一个
创建 foreign key 外键，指向另一个表 PRIMARY KEY 主键
ALTER TABLE OrderItems ADD CONSTRAINT FK_OrderItems_Orders FOREIGN KEY
(order_num) REFERENCES Orders (order_num)
把OrderItems 表中的order_num关联到Orders表中的order_num
标签：bsp ons ble add constrain 主键 一个 const 另一个
原文地址：https://www.cnblogs.com/guanong/p/10520871.html
