Sebuah perusahaan mempunyai beberapa
bagian. Masing-masing bagian mempunyai pengawas dan setidaknya satu pegawai.
Pegawai ditugaskan paling tidak di satu bagian (dapat pula dibeberapa bagian).
Paling tidak satu pegawai mendapat tugas di satu proyek. Tetapi seorang pegawai
dapat libur dan tidak dapat tugas di proyek.
Menentukan
entitas
Entitasnya : pengawas, bagian,
pegawai, proyek
Menentukan
relasi dengan matrik relasi
Menentukan Relasi
Gambar
ERD sementara
Hubungkan entitas sesuai dengan
matrik relasi yang dibuat
ERD Sementara
Mengisi
kardinalitas
Dari gambaran permasalahan dapat
diketahui bahwa:
- masing-masing bagian hanya punya satu pengawas
- seorang pengawas bertugas di satu bagian
- masing-masing bagian ada minimal satu pegawai
- masing-masing pegawai bekerja paling tidak di satu bagian
- masing-masing proyek dikerjakan paling tidak oleh satu pegawai
Mengisi kardinalitas
Menentukan kunci utama
Kunci utamanya: Nomor Pengawas, Nama Bagian, Nomor Pegawai, Nomor Proyek
Kunci utamanya: Nomor Pengawas, Nama Bagian, Nomor Pegawai, Nomor Proyek
Menentukan Kunci Utama
Menggambar
ERD berdasarkan kunci
Ada dua relasi many to many pada ERD
sementara, yaitu antara bagian dengan pegawai, pegawai dengan proyek, oleh
sebab itu kita buat entitas baru yaitu bagian -pegawai dan pegawai-proyek Kunci
utama dari entitas baru adalah kunci utama dari entitas lain yang akan menjadi
kunci tamu di entitas yang baru.
Menggambar ERD berdasarkan kunci
Menentukan
atribut
Atribut yang diperlukan adalah: nama
bagian, nama proyek, nama pegawai, nama pengawas, nomor proyek, nomor pegawai,
nomor pengawas
Memetakan
atribut
- Bagian : Nama bagian
- Proyek: Nama proyek
- Pegawai:Nama pegawai
- Pengawas: Nama pengawas
- Proyek-Pegawai : Nomor proyek, Nomor pegawai
- Pengawas: Nomor pengawas
Menggambar
ERD dengan atribut
Menggambar ERD dengan atribut
Memeriksa
Hasil
Periksa apakah masih terdapat
redundasi. ERD akhir: untuk pemodelan data pada sistem.
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