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Why Use Primary Keys and Foreign Keys in Databases? | LearnSQL.com
I created an ER diagram and formed relationships with foreign keys
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【database-design】如何在 Chen 表示法的擴展 ER 模型中表示外鍵?- SQL資料通
What is a foreign key in SQL Server
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Primary and foreign keys in MariaDB projects - Datensen
What is a foreign key? - Definition from TechTarget