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1. Create an ER model for each of the following descriptions: (a) Each Company operates four Departments, and each Department belongs one Company. (b) Each Department in part(a) employs one or more Employees, and eac Employee works for one Department with a startdate. (c) Each of the Employees in part (b) may or may not have one or mo Denendents and each Denendent belongs to one Emplovee

1. Create an ER model for each of the following descriptions: (a) Each Company operates four Departments, and each Department belongs one Company. (b) Each Department in part(a) employs one or more Employees, and eac Employee works for one Department with a startdate. (c) Each of the Employees in part (b) may or may not have one or mo Denendents and each Denendent belongs to one Emplovee

Database System Concepts
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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1. Create an ER model for each of the following descriptions: (a) Each Company operates four Departments, and each Department belongs to one Company. (b) Each Department in part(a) employs one or more Employees, and each Employee works for one Department with a startdate. (c) Each of the Employees in part (b) may or may not have one or more Dependents, and each Dependent belongs to one Employee. (d) suppose: Company with attributes cnumber, cname, caddress, President. Department with attributes dname, dnumber, location. Employee with attributes ename, ssn(for social security number), Sex, address, salary, birthdate. Dependent with attributes dpName, Sex, birthdate, and relationship (to the employee). (e) Represent all the ER diagrams described in (a), (b), (c) and (d) as a single ER diagram.
Transcribed Image Text:1. Create an ER model for each of the following descriptions: (a) Each Company operates four Departments, and each Department belongs to one Company. (b) Each Department in part(a) employs one or more Employees, and each Employee works for one Department with a startdate. (c) Each of the Employees in part (b) may or may not have one or more Dependents, and each Dependent belongs to one Employee. (d) suppose: Company with attributes cnumber, cname, caddress, President. Department with attributes dname, dnumber, location. Employee with attributes ename, ssn(for social security number), Sex, address, salary, birthdate. Dependent with attributes dpName, Sex, birthdate, and relationship (to the employee). (e) Represent all the ER diagrams described in (a), (b), (c) and (d) as a single ER diagram.
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