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Android Room databases follow a structured relational model where data is organized into tables with relationships between them. The relationships are defined using foreign keys, and there are three types of relationships possible in Room database:
One-to-one relationship: Where each row in one table is associated with only one row in another table.
One-to-many relationship: Where each row in one table can be associated with multiple rows in another table.
Many-to-many relationship: Where multiple rows in one table can be associated with multiple rows in another table.
These relationships are established by defining entities, which are mapped to database tables, and using annotations to represent the relationship between entities in the database. Room also provides support for loading related data through its DAO (Data Access Object) layer using queries that retrieve data from multiple tables.