# Room Database (Android)

> Local database with Room: Entity, DAO, Database, Relations, Migrations, TypeConverters, LiveData and Flow

- 25 interview questions
- Mid-Level
- [Interview Questions: Android](https://sharpskill.dev/en/technologies/android/interview-questions.md)

## 1. What is Room in Android?

**Answer**

Room is a persistence library that provides an abstraction layer over SQLite. It simplifies database access with annotations and generates code to avoid boilerplate. Room is part of Android Jetpack.

## 2. What are the 3 main components of Room?

**Answer**

The 3 main components of Room are: 1) Entity (represents a table), 2) DAO (Data Access Object, contains queries), 3) Database (abstract class containing database configuration and DAOs).

## 3. What is the @Entity annotation used for in Room?

**Answer**

@Entity marks a class as a database table. Each field in the class becomes a column. By default, the table name is the class name, but it can be customized with tableName.

## 22 more questions available

- How to define a primary key in a Room Entity?
- What is the @ColumnInfo annotation used for?

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