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Hirarki Data

Hirarki Data. Data bisnis telah diorganisasikan dalam hirarki field data record file Field data: unit data yg terkecil Record: suatu koleksi field2 data yg saling berhubungan. File: koleksi record yg saling berhubungan

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Hirarki Data

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  1. Hirarki Data • Data bisnis telah diorganisasikan dalam hirarki field data record file • Field data: unit data yg terkecil • Record: suatu koleksi field2 data yg saling berhubungan. • File: koleksi record yg saling berhubungan • Basis data: sekumpulan file, mrpk kumpulan dr seluruh data berbasis komputer sebuah prsh • Spread sheet adl basis data sederhana

  2. Flat files dan Field Kunci • File datar (flat files): suatu tabel yg tdk memiliki kolom2 yg berulang2 (di bwh adl contoh data yg berulang2 • Tabel hrs flat files krn kompt menghitung record secara urut dan jg memungkinkan utk dinormalisasi • Kunci (key) adl satu field yg berisi satu nilai yg secara unik mengidentifikasi masing2 record dlm tabel • Kandidat kunci (key candidate) adl sebuah field yg secara unik mengidentifikasi masing2 baris tabel namun tdk dipilih utk menjadi kunci

  3. Struktur Basis Data

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