A one-to-one relationship needs to be included between the user and subscription models.
用户与订阅模型之间需要包括一个一对一关系。
You can have a one-to-one relationship between a single unit of your content or a one-to-many relationship.
在每个内容单元中,您可以使用一对一的关系,也可以使用一对多的关系。
Also an Oracle instance can only have a one-to-one relationship with a database, while in DB2 this is not the case.
而且,Oracle实例与数据库只能是一对一的关系,而在DB 2中却不是这样。
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