Pertanyaan
19. Dalam database primary key digunakan untuk: a. Menyimpan semua data dalam tabel b identitas unik untuk setiap record c.data lama d. Menyimpan data sementara
Jawaban
Primary key dalam database digunakan untuk mengidentifikasi secara unik setiap baris (record) dalam sebuah tabel. Tidak ada dua record yang boleh memiliki nilai primary key yang sama. Opsi a, c, dan d salah karena primary key bukan untuk menyimpan semua data, data lama, atau data sementara. Fungsinya spesifik untuk identifikasi unik.
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