Rick and Ryan Enterprises is an agency that specializes in representing clients in the fields of sports and entertainment. Given the nature of the business, some employees are given a company car to drive and each company car must be assigned to an employee. Each employee has a unique employee number, plus an address and set of certifications. Not all employees have earned one or more certifications. Company cars are identified by their vehicle ID and also contain a license plate number, make, model, and year. Employees represent clients. Not all employees represent clients while some employees represent many clients. Each client is represented by one and only one employee. Each client has a unique client number. Additional attributes required for each client are name, address, and date of birth. Draw an ER diagram that shows the entity types and the relationship types for Rick and Ryan Enterprises. While you must name each relationship type and define the structural constraints (cardinality ratio and participation constraints), it is not necessary that you supply role names. Please underline the unique identifiers.

Rick and Ryan Enterprises is an agency that specializes in representing clients in the fields of sports and entertainment. Given the nature of the business, some employees are given a company car to drive and each company car must be assigned to an employee. Each employee has a unique employee number, plus an address and set of certifications. Not all employees have earned one or more certifications. Company cars are identified by their vehicle ID and also contain a license plate number, make, model, and year. Employees represent clients. Not all employees represent clients while some employees represent many clients. Each client is represented by one and only one employee. Each client has a unique client number. Additional attributes required for each client are name, address, and date of birth. Draw an ER diagram that shows the entity types and the relationship types for Rick and Ryan Enterprises. While you must name each relationship type and define the structural constraints (cardinality ratio and participation constraints), it is not necessary that you supply role names. Please underline the unique identifiers.

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

2. A university (e.g., University of Houston, Texas A&M, Baylor, SMU, LSU, etc.) administers a
number of various funds that have been created for scholarships, faculty development,
research support, etc.) Donors (individuals, companies, foundations, etc.) are solicited by the
various universities to donate money to these funds. If you are not already, when you
graduate you will see that I'm talking about.
UNIVERSITY
Solicts
q
1
Administers
n
FUND
m
Donates
Р
DONOR
Note: m, p,q, r each represent many.
a. Revise this ER diagram to reflect the possibility that a university may exist without
administering any funds.
b. Revise this ER diagram to reflect the possibility that a solicited donor may have never
donated to any fund.
c. Revise this ER diagram to reflect that a solicited donor is allowed to donate to at most only
one fund.

1. Rick and Ryan Enterprises is an agency that specializes in representing clients in the fields
of sports and entertainment. Given the nature of the business, some employees are given a
company car to drive and each company car must be assigned to an employee. Each
employee has a unique employee number, plus an address and set of certifications. Not all
employees have earned one or more certifications. Company cars are identified by their
vehicle ID and also contain a license plate number, make, model, and year. Employees
represent clients. Not all employees represent clients while some employees represent many
clients. Each client is represented by one and only one employee. Each client has a unique
client number. Additional attributes required for each client are name, address, and date of
birth.
Draw an ER diagram that shows the entity types and the relationship types for Rick and Ryan
Enterprises. While you must name each relationship type and define the structural constraints
(cardinality ratio and participation constraints), it is not necessary that you supply role names.
Please underline the unique identifiers.

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