Saving Data on Android

Chapter 6: Entity Definition
: You can define a database as a set of entities and 
relations. In this chapter, you'll learn how to create a DB with Room starting from 
the entities. You'll create, step by step, a sample application using the annotations 
provided by the framework.
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Chapter 7: Mastering Relations
: As said in the previous chapter, entities and 
relations are the most important concepts in a relational DB. In this chapter, you'll 
learn how to define relations and how to read related data efficiently.
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