a) Modify the ER model such that each editor edits at most one book and works with at most one author. b) Modify the ER model such that each editor edits at least one book and works with at least one author. c) Modify the ER model such that each author writes exactly one book and works with exactly one editor. Each editor edits at least one book and works with at least one author.
a) Modify the ER model such that each editor edits at most one book and works with at most one author. b) Modify the ER model such that each editor edits at least one book and works with at least one author. c) Modify the ER model such that each author writes exactly one book and works with exactly one editor. Each editor edits at least one book and works with at least one author.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Question
a) Modify the ER model such that each editor edits at most one book and works with at most one author.
b) Modify the ER model such that each editor edits at least one book and works with at least one author.
c) Modify the ER model such that each author writes exactly one book and works with exactly one editor. Each editor edits at least one book and works with at least one author.
Transcribed Image Text:Consider the following ER model about books written by authors. Assuming there
are 30 authors, 100 books and 10 editors, answer these questions:
Editors
eid
aid
R
Authors
Books
bid
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