Database Systems: Design, Implementation, & Management
13th Edition
ISBN: 9781337627900
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Chapter 4, Problem 20RQ
Describe precisely the composition of the DEPENDENT weak entity’s primary key. Use proper terminology in your answer.
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What is the definition of "weak entity type"? Does it have a secret? Can you elucidate what "attribute" means?How would sia appear on an ER chart? Please depict with a diagram.
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Chapter 4 Solutions
Database Systems: Design, Implementation, & Management
Ch. 4 - Prob. 1RQCh. 4 - What is a strong (or identifying) relationship,...Ch. 4 - Prob. 4RQCh. 4 - Suppose you are working within the framework of...Ch. 4 - Prob. 6RQCh. 4 - Prob. 7RQCh. 4 - Discuss the difference between a composite key and...Ch. 4 - What two courses of action are available to a...Ch. 4 - What is a derived attribute? Give an example. What...Ch. 4 - Prob. 11RQ
Ch. 4 - Discuss two ways in which the 1:M relationship...Ch. 4 - Prob. 13RQCh. 4 - Prob. 14RQCh. 4 - Briefly, but precisely, explain the difference...Ch. 4 - What are multivalued attributes, and how can they...Ch. 4 - Prob. 17RQCh. 4 - Prob. 18RQCh. 4 - What two attributes must be contained in the...Ch. 4 - Describe precisely the composition of the...Ch. 4 - Prob. 21RQCh. 4 - Prob. 1PCh. 4 - Create a complete ERD in Crows Foot notation that...Ch. 4 - Prob. 4PCh. 4 - Prob. 5PCh. 4 - Prob. 6PCh. 4 - Prob. 7PCh. 4 - Prob. 8PCh. 4 - Prob. 9PCh. 4 - Prob. 10PCh. 4 - Prob. 11C
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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
- Just what does "weak entity type" mean? Is there a secret to it? Can you explain the meaning of "attribute"?How does sia look like on an ER chart? Please illustrate with a diagram.arrow_forwardWhat are the two requirements that an entity must meet in order to be classified as a weak entity?Give an example of a weak or susceptible entity to illustrate your point.arrow_forwardWhat exactly does it mean to be a "weak entity type"? Do you know the trick? What exactly does the word "attribute" mean?What does an ER chart look like for sia? If possible, a schematic would be helpful.arrow_forward
- Why are weak and strong entity sets different?arrow_forwardIn the attached diagram, which of the following statements are true? primary key for section is course_id, sec_id, semester, year primary key for section is equivalent to the primary key for course unioned with the discrimator section is a weak entity set whose existence depends on course the discrimator of section is sec_id, semester, yeararrow_forwardBy adding the primary-key characteristics of the identifying entity set in its attributes, a weak entity set may always be converted into a strong entity set. Describe the kind of redundancy that will result from our choice.arrow_forward
- Every flimsy entity set may be strengthened by the addition of pertinent characteristics. What therefore, is the cause of our subpar entity sets?arrow_forwardhow to graphically identify an entity, a the cardinality (o,N), a weak relation ship, and a strong relationship in a Crow's Foot ntation?arrow_forwardAnalyze the given entity relationship diagram and answer the following questions. What is the degree of “has” relationship?arrow_forward
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