# Room Database (Android) > Database lokal dengan Room: Entity, DAO, Database, Relations, Migrations, TypeConverters, LiveData dan Flow - 25 pertanyaan wawancara - Mid-Level - [Pertanyaan Wawancara: Android](https://sharpskill.dev/id/technologies/android/pertanyaan-wawancara.md) ## 1. Apa itu Room di Android? **Jawaban** Room adalah library persistensi yang menyediakan lapisan abstraksi di atas SQLite. Room menyederhanakan akses database dengan anotasi dan menghasilkan kode untuk menghindari boilerplate. Room merupakan bagian dari Android Jetpack. ## 2. Apa saja 3 komponen utama Room? **Jawaban** 3 komponen utama Room adalah: 1) Entity (merepresentasikan tabel), 2) DAO (Data Access Object, berisi query), 3) Database (kelas abstrak yang berisi konfigurasi database dan DAO). ## 3. Apa kegunaan anotasi @Entity di Room? **Jawaban** @Entity menandai sebuah kelas sebagai tabel database. Setiap field di kelas menjadi kolom. Secara default, nama tabel adalah nama kelas, tetapi dapat dikustomisasi dengan tableName. ## 22 pertanyaan lagi tersedia - Bagaimana cara mendefinisikan primary key di Entity Room? - Apa kegunaan anotasi @ColumnInfo? 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