摘要：
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 阅读全文
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摘要：
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 阅读全文
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