Sabtu, 16 Februari 2013

Konsep Entitas dan Relasi

download disini


  • Tambahan: ada yang disebut dengan Alternatif key, ini memudahkan operasi dalam mencari data atau mengambil data. contoh pengurutan nama sesuai abjat.
  •  data hierarki adalah data pohon yang saling berhubungan, namun ada redundansi data di dalamnya.
  • data jaringan adalah data yang hampir sama dengan data hierarkim tetapi status relasi lebih jelas dan meminimalisir redundansi data.
contoh data hierarki dan data jaringan disini

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