關於「ERD foreign key」標籤，搜尋引擎有相關的訊息討論：

How to represent foreign key in an ER diagram?dba.stackexchange.com › questions › how-to-represent-for...Entity Relationship Diagram (ERD) Tutorial - Part 2 - YouTubewww.youtube.com › watchForeign Key ER Diagram - YouTubewww.youtube.com › watchWhat is an Entity Relationship Dia