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数据库 外键 - Google Search
大家设计数据库时使用外键吗？ - 知乎
MySQL 主键、外键、索引 - 知乎
数据库的主键与外键的区别-温故而知新-51CTO博客
主键 - 廖雪峰的官方网站
外键 - 廖雪峰的官方网站
索引 - 廖雪峰的官方网站
SQL的主键和外键的作用 - 简书
数据库的几个概念：主键，外键，索引，唯一索引_数据库_xrt95050的专栏-CSDN博客
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