Database Systems: Design, Implementation, & Management
Database Systems: Design, Implementation, & Management
12th Edition
ISBN: 9781305627482
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Chapter 4, Problem 1P

Explanation of Solution

ER Diagram:

The following figure illustrates the Entity Relationship Diagram (ERD) for given business rules in Crow’s Foot notation:

Explanation:

  • The “ASSIGNMENT” entity is optional for the “PROJECT”, because it allows a user to create a new project without creating a new assignment...

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How to make a Crow's Foot ERD for the following: A company has a number of employees. The attributes of EMPLOYEE include Name, Address, and Birth-date. The company also has several projects. The attributes of Project include Project_Code, Description, and Start_date. Each employee may be assigned to one or more projects, or may not be assigned to any project. A project is required to have at least one employee assigned, but may have several employees assigned.
Use the following business rules to create a Crow’s Foot ERD. Present all appropriate connectivities and cardinalities in the ERD. A department employs many employees, but each employee is employed by one department. Some employees 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.
Use the following business rules to create a Crow’s Foot ERD. Write all appropriate connectivities and cardinalities in the ERD. a. A department employs many employees, but each employee is employed by one department. b. Some employees, known as “rovers,” are not assigned to any department. c. A division operates many departments, but each department is operated by one division. d. An employee may be assigned many projects, and a project may have many employees assigned to it. e. A project must have at least one employee assigned to it. f. One of the employees manages each department, and each department is managed by only one employee. g. One of the employees runs each division, and each division is run by only one employee. Given these data requirements, design a logical/relational data model for this company. Use Microsoft Visio for your diagrams. You can add substantial detail to your data model by including sample attributes for each of the entities. Specify primary and foreign…
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