Modern Database Management
13th Edition
ISBN: 9780134773650
Author: Hoffer
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Textbook Question
Chapter 4, Problem 4.15RQ
Briefly describe four typical problems that often arise in merging relations and common techniques for addressing those problems.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
Please transform the following Entity-Relationship Schema (Diagram) into a Relational
Schema. Please do not forget to specify the keys and constraints for each relation. (RESP_ENG:
the engineer responsible for the project. WORKS_ON: the project an engineer works on).
MANAGES
SSNO
FName
PNo
PROJECT
EMPLOYEE
LName
PName
|1
Address
\ISA
WORKS
ON
ENGINEER
Speciality
RESP
ENG
What is the reason for normalised relations may not compromise an efficient physical implementation structure ?
Briefly describe four problems that may arise when merging relations
Chapter 4 Solutions
Modern Database Management
Ch. 4 - Define each of the following terms: determinant...Ch. 4 - Prob. 4.2RQCh. 4 - Prob. 4.3RQCh. 4 - Describe the primary differences between the...Ch. 4 - Summarize six important properties of relations.Ch. 4 - Describe two properties that each candidate key...Ch. 4 - Describe the three types of anomalies that can...Ch. 4 - Demonstrate each of the anomaly types with an...Ch. 4 - Fill in the blanks in each of the following...Ch. 4 - What is a well-structured relation? Why are...
Ch. 4 - Prob. 4.11RQCh. 4 - Describe how the following components of an E-R...Ch. 4 - Prob. 4.13RQCh. 4 - Prob. 4.14RQCh. 4 - Briefly describe four typical problems that often...Ch. 4 - Prob. 4.16RQCh. 4 - Explain how each of the following types of...Ch. 4 - Prob. 4.18RQCh. 4 - Prob. 4.19RQCh. 4 - Prob. 4.20RQCh. 4 - Prob. 4.21RQCh. 4 - What is the relationship between the primary key...Ch. 4 - Prob. 4.23RQCh. 4 - Explain what can be done with primary keys to...Ch. 4 - Prob. 4.25RQCh. 4 - Explain three conditions that suggest a surrogate...Ch. 4 - Prob. 4.27RQCh. 4 - For each of the following E-R diagrams from...Ch. 4 - Prob. 4.29PAECh. 4 - Prob. 4.30PAECh. 4 - For your answers to the following Problems and...Ch. 4 - Figure 4-3212 shows a class list for Millennium...Ch. 4 - Prob. 4.33PAECh. 4 - Prob. 4.34PAECh. 4 - Prob. 4.35PAECh. 4 - Prob. 4.36PAECh. 4 - Prob. 4.37PAECh. 4 - Prob. 4.38PAECh. 4 - Prob. 4.39PAECh. 4 - Transform Figure 2-15a, attribute version, to 3NF...Ch. 4 - The Public Safety office at Millennium College...Ch. 4 - Prob. 4.42PAECh. 4 - Prob. 4.43PAECh. 4 - Prob. 4.44PAECh. 4 - For your answers to Problem and Exercise 3-33 from...Ch. 4 - Prob. 4.46PAECh. 4 - Prob. 4.47PAECh. 4 - Figure 4-38 includes an EER diagram for a...Ch. 4 - Prob. 4.49PAECh. 4 - Prob. 4.50PAECh. 4 - Prob. 4.51PAECh. 4 - Prob. 4.52PAECh. 4 - Figure 4-40 shows an EER diagram for a university...Ch. 4 - Explore the data included in Table 4-9. Assume...Ch. 4 - Prob. 4.55PAECh. 4 - Prob. 4.56PAECh. 4 - Prob. 4.57PAECh. 4 - Prob. 4.58PAE
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.Similar questions
- Justify how the main key of a relation is connected to all of the qualities of the relationship in issue, as well as the functional dependencies that exist among all of those features.arrow_forward13 of 40 Consider the following E/R diagram with isa relationships, noting that attribute a is the key of R. If we use an E/R-style approach and convert this diagram into relations, which of the following relations will be among the result? R d Select one: O ST(a,b,c,d) O s(a,c) O T(a,b,d) O R(a,c,d)arrow_forwardA subtype/supertype relationships are especially important in Enhanced Entity Relationship Modeling. Explain using an example how you would covert subtype/supertype relationships to relations in database design.arrow_forward
- What are the pros and cons that you can see of representing relations as a graph or a matrix? What is one way that you might use either a graph or a matrix to represent a relation in computer science?arrow_forwardDefine three conditions under which it is appropriate to use a surrogate key in place of the primary key of a relation.arrow_forwardExplain three conditions that suggest a surrogate key should be created for the primary key of a relation.arrow_forward
- 2. a. What characteristics do tables that conform to the concept of well-informed relations have? b. Describe a dependency diagram and explain its purpose c. Normalize the relation given below Order Orde PartN | Part Unit PartQ | Supplie Suppli Suplli Suppl Suppli Supplier rDat umbe Nam Pric uantit rNumb erNam erStre Num ierCit erSateZip e e e er etarrow_forwardConsider the following E/R diagram with isa relationships, noting that attribute b is the key of R. If we use an E/R-style approach and convert this diagram into relations, which of the following relations will be among the result? Select one: Y(a,c,d) T(a,b,d) Z(b,c) S X(a,b,c,d) R barrow_forwardPlease read this carefully and Draw an EER diagram for a database of a hospital following these requirements: create Four to five regular strong entities. A union One 1:1, one 1:N, and one N:M relationship – of which at least one relationship should be partial and one full. One overlap relationship and one disjoint relationship. Other notes: Do not emphasize on too many attributes for the entities. Two to three attributes for each entity will be enough. Make sure to include a primary key for each entity.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Database Systems: Design, Implementation, & Manag...Computer ScienceISBN:9781305627482Author:Carlos Coronel, Steven MorrisPublisher:Cengage Learning
Database Systems: Design, Implementation, & Manag...
Computer Science
ISBN:9781305627482
Author:Carlos Coronel, Steven Morris
Publisher:Cengage Learning
Enhanced Entity Relationship Model; Author: Data Science Center;https://www.youtube.com/watch?v=ocQUtXPumdQ;License: Standard YouTube License, CC-BY