Imagine 2 tables in a relational database, e.g. Person and Billing. There is a (non-mandatory) OneToOne association defined between these entities, and they share the Person primary key (i.e. PERSON_ID is defined in both Person and Billing, and it is a foreign key in the latter).Imagine 2 tables in a relational database, e.g.
阅读背景：
与共享主键的OneToOne关系生成n + 1个选择;任何解决方法？
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