主键外键有何区别?实例对比+避坑指南,主键外键辨析,实例解析与避坑攻略
What are the differences between primary keys and foreign keys? Case comparison + pitfall avoidance guide, analysis of primary keys and foreign keys, case analysis and pitfall avoidance strategies
以上为机器翻译结果，长、整句建议使用 人工翻译 。