Database Systems: Design, Implementation, & Management
13th Edition
ISBN: 9781337627900
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Chapter 2, Problem 1P
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Business rule for given relationship:
- From the given data, note that an AGENT through AGENT_CODE can occur many times in the CUSTOMER table.
- But each CUSTOMER is related to only one AGENT.
- The business rule for the relationship between AGENT and CUSTOMER can be written as follows...
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Draw an Entity Relationship diagram for modeling the following system. Use relational modelling techniques in your design. You are free to make reasonable assumptions for your model unless they conflict with the definition below. Also explain your design with a paragraph. [Caution: Create your solution using paper and pen. Then put the image of your solution here. Drawing/writing with computer tools will not be accepted. Also include your name and signature in the solution paper]Problem definition: “There is a need to keep track of data for a hospital. The hospital building consists of several departments. Each department is identified with its name. For each department, the following data should also be stored: the number of floors, opening hour, and closing hour. Each department has a number of rooms. Each room is identified by its room number, but there might be rooms with the same name in different departments. At each department, many doctors and nurses can work.A doctor is…
Question 3
Draw a complete ER diagram using Crow's foot notation based on the given business
rules below:
A sales representative can write many invoices. (In a business environment, each
invoice represents a sales transaction. Given the "commission set" label, one
might
infer that the sales rep earns a commission on each sale for which an invoice is
written)
Each invoice is written by a single sales representative.
A customer can generate many invoices. (Each time a customer makes a purchase of
one or more items, and invoice is generated)
Each invoice is generated by a single customer.
Each invoice includes one or more invoice lines. (Each item purchased is recorded in
an invoice line)
Each invoice line is associated with one (and only one) invoice.
Each invoice line records a single product.
Each product can be recorded in many invoice lines. (If the inventory contains 100
hammers, each one may be sold and, therefore, each of those 100 hammers may
at
some point be recorded in an…
b. Draw an Entity Relationship diagram from each of the following descriptions. Include the attributes, primary keys (underlines) and the relationships in the diagram (like relationship in Access).
i. Each of the department has many employees assigned to it, but each employee works for only one department.
if. A customer can rent many videotapes from the video store. Each of the videotapes can be rented to many customers.
Chapter 2 Solutions
Database Systems: Design, Implementation, & Management
Ch. 2 - Prob. 1RQCh. 2 - What is a business rule, and what is its purpose...Ch. 2 - How do you translate business rules into data...Ch. 2 - Prob. 4RQCh. 2 - Explain how the entity relationship (ER) model...Ch. 2 - Prob. 6RQCh. 2 - Prob. 7RQCh. 2 - Prob. 8RQCh. 2 - Prob. 9RQCh. 2 - Prob. 10RQ
Ch. 2 - What is a relationship, and what three types of...Ch. 2 - Give an example of each of the three types of...Ch. 2 - What is a table, and what role does it play in the...Ch. 2 - Prob. 14RQCh. 2 - Prob. 15RQCh. 2 - Prob. 16RQCh. 2 - Prob. 17RQCh. 2 - Prob. 18RQCh. 2 - Prob. 19RQCh. 2 - Prob. 21RQCh. 2 - Prob. 22RQCh. 2 - Prob. 1PCh. 2 - Prob. 2PCh. 2 - Prob. 3PCh. 2 - Prob. 4PCh. 2 - Prob. 5PCh. 2 - Using Figure P2.6 as your guide, work Problems 68....Ch. 2 - Prob. 7PCh. 2 - Prob. 8PCh. 2 - Typically, a hospital patient receives medications...Ch. 2 - Prob. 10PCh. 2 - Prob. 11PCh. 2 - Prob. 12PCh. 2 - Prob. 13PCh. 2 - Prob. 14PCh. 2 - Prob. 15PCh. 2 - Prob. 16PCh. 2 - Prob. 17P
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