Write all appropriate connectivities and cardinalities in the ERD.
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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5. Use the following business rules to create a Crow’s Foot ERD. Write all appropriate connectivities and cardinalities in the ERD.
• A department employs many employees, but each employee is employed by one department.
• Some employees, known as “rovers,” are not assigned to any department.
• A division operates many departments, but each department is operated by one division.
• An employee may be assigned many projects, and a project may have many employees assigned to it.
• A project must have at least one employee assigned to it.
• One of the employees manages each department, and each department is managed by only one employee.
• One of the employees runs each division, and each division is run by only one employee.
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