Database Systems: Design, Implementation, & Management
13th Edition
ISBN: 9781337627900
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Expert Solution & Answer
Chapter 5, Problem 7P
Explanation of Solution
Crow’s Foot ER diagram for FlyRight Aircraft Maintenance division of the FlyRight Company:
The following data model shows the solution for the given question.
Explanation:
- In the above data model, the disjoint constraint (d) is used as a category symbol. Here the “Employee” supertype entity has optional subtypes. The primary of “Employee” entity is “Emp_No”...
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Students have asked these similar questions
A manufacturing company produces products. The following product information is stored: product name, product ID and quantity on hand. These products are made up of many components. Each component can be supplied by one or more suppliers. The following component information is kept: component ID, name, description, suppliers who supply them, and products in which they are used.
Create an ERD to show how you would track this information.
Show entity names (5m), primary keys (5m), attributes for each entity (5m), relationships between the entities (4m) and cardinality (4m).
Assumptions
A supplier can exist without providing components.
A component does not have to be associated with a supplier.
A component does not have to be associated with a product. Not all components are used in products.
A product cannot exist without components.
Instructions: Create a dimensional model for a particular business process involving
gym membership. A customer can sign up for a membership of say one, three, six or
twelve months. I want to make it easy to query to identify current members, members
who expired in the last month, members who renewed in the last month, those who are
pending expiry etc.
If I have a basic model with a fact table representing a gym membership say
start_date_key
end_date_key
membership_attribute_key
customer_atrribute_key
fee
with associated dimension table for date, membership attributes such as length,
customer attributes and so forth. On a particular day, the active members are those with
a start date before the day and an end date after that day. Those who will expire next
month are those where the end date is in a particular date range.
A manufacturing company produces products. The following product information is stored:
product name, product ID and quantity on hand. These products are made up of many
components. Each component can be supplied by one or more suppliers. The following
component information is kept: component ID, name, description, suppliers who supply
them, and products in which they are used.
Create an ERD to show how you would track this information. Show entity names, primary
keys, attributes for each entity, and relationships between the entities.
Assumptions:
• A supplier can exist without providing components.
• A component does not have to be associated with a supplier.
• A component does not have to be associated with a product. Not all components are used
in products.
• A product cannot exist without components.
Chapter 5 Solutions
Database Systems: Design, Implementation, & Management
Ch. 5 - Prob. 1RQCh. 5 - What kinds of data would you store in an entity...Ch. 5 - Prob. 3RQCh. 5 - What is a subtype discriminator? Give an example...Ch. 5 - Prob. 5RQCh. 5 - What is a disjoint subtype? Give an example.Ch. 5 - What is the difference between partial...Ch. 5 - Prob. 8RQCh. 5 - According to the data model, is it required that...Ch. 5 - Prob. 10RQ
Ch. 5 - Prob. 11RQCh. 5 - Prob. 12RQCh. 5 - Prob. 13RQCh. 5 - Prob. 14RQCh. 5 - When implementing a 1:1 relationship, where should...Ch. 5 - What is time-variant data, and how would you deal...Ch. 5 - Prob. 17RQCh. 5 - Prob. 1PCh. 5 - Prob. 2PCh. 5 - Prob. 3PCh. 5 - Prob. 4PCh. 5 - Prob. 5PCh. 5 - Prob. 6PCh. 5 - Prob. 7PCh. 5 - Prob. 8CCh. 5 - Prob. 9CCh. 5 - Prob. 10C
Knowledge Booster
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