Modern Database Management
13th Edition
ISBN: 9780134773650
Author: Hoffer
Publisher: PEARSON
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Textbook Question
Chapter 3, Problem 3.2RQ
Match the following terms and definitions:
_____supertype
_____entity cluster
_____subtype
_____specialization
_____subtype discriminator
_____attribute inheritance
_____generalization
- subset of supertype
- creating a supertype for entity types
- subtype gets supertype attributes
- generalized entity type
- creating subtypes for an entity type
- a group of associated entity types and relationships
- locates target subtype for an entity
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Q.No.1.a. Draw ER- notation for the given elements of ER-Model.
Entities
Strong Entity
Weak Entity
Associative Entity
Relationship Degree
Unary
Binary
Ternary
Relationship Cardinality
Mandatory One
Mandatory Many
Optional One
Optional Many
Answer:
b.Separate Entities and Attributes from the list given below:
Skill
Student
Course
Regno
DepartmentName
ProductID
Salary
Project
DateCompleted
Hobby
Answer:
Unified Modelling Language (UML) is often used as a notation when drawing Entity-RelationshipDiagrams (ERDs) since it is a notation that software developers are already familiar with.
What is the difference between a binary relationship and a unary relationship?Provide an example of each as part of your answer.
Draw an Entity Relationship Diagram (ERD) using Unified Modelling Language(UML) notation according to the below business rules. Your design should be atthe logical level – include primary and foreign key fields and remember toremove any many-to-many relationships.Legal system – business rules:• In the legal system, a judge hears many cases throughout their career.• Each case can be heard by multiple judges in some circumstances.• A case has a date and title that needs to be recorded in the database.• The name and surname of each judge needs to be stored.• A judge can have multiple qualifications (with minimum of one), and eachqualification is related to only one specific judge.•…
Based on:
Entity-Relationship Diagram with the following requirements:
There are Professors (ie users) with the changeable attributes Professor_Name, Field, College, PhD_Date
There are Flubs (ie posts) with the unchangeable attributes Content, Purpose, Moment, Inventor (which is the creating Professor)
There are Bounces (ie shares) where a Professor can share another Professor's Flub
Add ID attributes as necessary
Content of Flubs only needs to be a text of fixed length
Professors can have/be Colleagues (ie friends/followers)
A Flub can get Citations (ie likes) by other Professors
Show the Relational Algebra AND Domain Relational Calculus formulas for each.
Show a portfolio of the Flubs by a Professor
Show a portfolio of all Flubs and Bounces (the Flubs bounced) by all of a Professor's Colleagues
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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