Modern Database Management
13th Edition
ISBN: 9780134773650
Author: Hoffer
Publisher: PEARSON
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Textbook Question
Chapter 3, Problem 3.16RQ
In Figure 3-5b, why must the minimum cardinality next to SUPPLIES from PURCHASED PART be one yet the minimum cardinality next to SUPPLIES from SUPPLIER may be zero?
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Students have asked these similar questions
16.What is the compact way to assess the modality for customers buying from salesperson?
A: customers buy from many salespersons
B: customers buy from only one salesperson
C: customers buy from at most one salesperson
D: customers buy from at least one salesperson
We have a ternary relationship below:
Job
ID
Employee
Branch
Work
ID
ID
The following rule applies to this system:
One employee only works on one job
One employee only works for one branch
One branch offers many jobs
A job could exist in
many
branches
Many employees are doing same jobs in one branch
Can we decompose the ternary relationship to three binary relationship?
If so, how?
for the following entities and relationships: Customer, Order, Product, ProductDepartment.
One customer can place many orders
One order is placed by only one customer.
Customers can buy many products in one order.
One product can be purchased by many orders.
One product belongs to one ProductDeparment.
One productdepartment has many products.
what is the maximal cardinality between customer and order?
what is the maximal cardinality between product and order?
what is the maximal cardinality between product and productDepartment?
Chapter 3 Solutions
Modern Database Management
Ch. 3 - Define each of the following terms: supertype...Ch. 3 - Match the following terms and definitions:...Ch. 3 - Contrast the following terms: supertype; subtype...Ch. 3 - State two conditions that indicate when a database...Ch. 3 - Prob. 3.5RQCh. 3 - Give an example (other than those discussed in the...Ch. 3 - What is the attribute inheritance? Why is it...Ch. 3 - Give an example of each of the following: a...Ch. 3 - What types of business rules are normally captured...Ch. 3 - What is the purpose of a subtype discriminator?
Ch. 3 - Prob. 3.11RQCh. 3 - In what ways is starting a data modeling project...Ch. 3 - Prob. 3.13RQCh. 3 - Prob. 3.14RQCh. 3 - What do you purchase when you acquire a packaged...Ch. 3 - In Figure 3-5b, why must the minimum cardinality...Ch. 3 - When is a member of a supertype always a member of...Ch. 3 - Examine the hierarchy for the university EER...Ch. 3 - Add a subtype discriminator for each of the...Ch. 3 - For simplicity, subtype discriminators were left...Ch. 3 - Refer to the employee EER diagram in Figure 3-2....Ch. 3 - Refer to the EER diagram for patients in Figure...Ch. 3 - Figure 3-13 shows the development Of entity...Ch. 3 - Refer to Problem and Exercise 2-44 in Chapter 2...Ch. 3 - For a library, the entity type HOLDING has four...Ch. 3 - A bank has three types of accounts: checking,...Ch. 3 - Refer to your answer to Problem and Exercise 2-4...Ch. 3 - Refer to your answer to Problem and Exercise 3-24...Ch. 3 - Prob. 3.29PAECh. 3 - Draw an EER diagram for the following situation:...Ch. 3 - Develop an EER model for the following situation,...Ch. 3 - Prob. 3.32PAECh. 3 - Prob. 3.33PAECh. 3 - Prob. 3.34PAECh. 3 - Based on the EER diagram constructed for Problem...Ch. 3 - Prob. 3.36PAECh. 3 - Prob. 3.37PAECh. 3 - Add the following to Figure 3-16: An EMPLOYMENT...
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