SISTEM BASIS DATA 2 (MODEL EER BAGIAN 1)




Konsep Model EER adalah Semua Konsep ER + Konsep superclass / subclass, specialization, generalization dan categorization. 











Generalisasi merupakan proses mendefinisikan beberapa tipe entitas dan
pembentukannya secara Bottom-Up.
Contoh generalisasi sebagai berikut :
  •  Kendaraan merupakan generalisasi dari Mobil dan Truk.
  •  Pegawai merupakan generalisasi dari Sekretaris dan Teknisi berdasarkan jenis   pekerjaannya.
  •  Pegawai merupakan generalisasi dari Pegawai Tetap, Pegawai Honorer dan   Konsultan.  







































Komentar

Posting Komentar

Postingan populer dari blog ini

TASK 5: ADVERB CLAUSES

1.        ___________ they are tropical birds, parrots can live in temperate or even cold climates. A. Despite B. Even though C. Nevertheless D. But 2.       Natural silk is still highly prized _______ similar artificial fabrics. A. although is available B. despite there are available C. in spite of the availability of D. even though an availability of 3.       The president of the United States appoints the cabinet members, ______ appointments are subject to Senate approval. A. their B. with their C. because their D. but their 4.       The prisoners were prevented from speaking to reporters because ______. A. not wanting the story in the papers B. the story in the papers the superintenden t did not want C. the public to hear the story D. the superintendent did not want the story in the papers 5.       _...
Baca selengkapnya

TASK 2: INCOMPLETE INDEPENDENT CLAUSES PART 2

1.     ________ by cosmic rays. (A)    The earth is constantly bombarded (B)    Bombarded constantly, the earth (C)    Bombarding the earth constantly (D)    The earth's constant bombardment Answer: (A) The earth is constantly bombarded 2.     ________ primary colors are red, blue, and yellow. (A) There are three (B) The three (C) Three of them (D) That the three Answer: (B) The three 3.     ______who was elected the first woman mayor of Chicago in 1979. (A) It was Jane Byrne (B) Jane Byrne (C) That Jane Byrne (D) When Jane Byrne Answer: (A) It was Jane Byrne 4.     Every computer consists of a number of systems ______ together. (A) by working (B) work (C) they work (D) that work Answer: (D) that work 5.     On the Moon, ______ air because the Moon's gravitational field is too weak to retain an atmosphere. (A) th...
Baca selengkapnya

TASK 1: INCOMPLETE INDEPENDENT CLAUSES PART I

1.     In the United States, _________ is generally the responsibility of municipal governments.           (A) for water treatment           (B) water treatment           (C) where water treatment           (D) in which water treatment answer : (B) Water treatment 2.     Crop rotation _________ of preserving soil fertility. (A) it is one method (B) one method (C) a method is one (D) is one method answer: (D) is one method 3.     ___________ the dollar as its monetary unit in 1878. (A) Canada adopted (B) Adopted by Canada, (C) It was adopted by Canada (D) The Canadian adoption of answer: (A) Canada adopted 4 .     __________ almost impossible to capture the beauty of the aurora borealis in     photographs. (A) Being (B) His (C) There is (D) Is answer: (C) Ther...
Baca selengkapnya