Modern Database Management
13th Edition
ISBN: 9780134773650
Author: Hoffer
Publisher: PEARSON
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Textbook Question
Chapter 2, Problem 2.12RQ
Give an example, Other than those described in this chapter, of a weak entity type. What is the identifier attribute of a weak entity?
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Is it accurate that associative entities are also regarded as weak entities? What justification or lack thereof do you have? If true, how does their "weakness" differ from that of others?
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Is it true that associative entities are likewise considered to be weak entities? What is your reasoning or lack thereof? If so, what distinguishes their "weakness" from others?
Chapter 2 Solutions
Modern Database Management
Ch. 2 - Define each of the following terms: entity type...Ch. 2 - Match the following terms and definitions....Ch. 2 - Contrast the following terms: stored attribute;...Ch. 2 - Prob. 2.4RQCh. 2 - Prob. 2.5RQCh. 2 - Prob. 2.6RQCh. 2 - State six general guidelines for naming data...Ch. 2 - Prob. 2.8RQCh. 2 - Prob. 2.9RQCh. 2 - State three conditions that suggest the designer...
Ch. 2 - List the four types of cardinality constraints,...Ch. 2 - Give an example, Other than those described in...Ch. 2 - What is the degree of a relationship? List the...Ch. 2 - Give an example (Other than those described in...Ch. 2 - Give an example of each of the following, other...Ch. 2 - Give an example of the use of effective (or...Ch. 2 - State a rule that says when to extract an...Ch. 2 - Prob. 2.18RQCh. 2 - In addition to explaining what action is being...Ch. 2 - For the Manages relationship in Figure 2-12a,...Ch. 2 - Explain the distinction between entity type and...Ch. 2 - Why is it recommended that every ternary...Ch. 2 - A cellular operator needs a database to keep track...Ch. 2 - Prob. 2.24PAECh. 2 - Answer the following questions concerning Figure...Ch. 2 - Prob. 2.26PAECh. 2 - You may have been assigned a CASE or a drawing...Ch. 2 - Consider the two E-R diagrams in Figure 2-25 Q,...Ch. 2 - Prob. 2.29PAECh. 2 - Are associative entities also weak entities? Why...Ch. 2 - Because Visio does not explicitly show associative...Ch. 2 - Figure 2-26 shows a grade report that is mailed to...Ch. 2 - Prob. 2.33PAECh. 2 - The Is Married To relationship in Figure 2-12a...Ch. 2 - Figure 2-27 represents a situation of students who...Ch. 2 - Figure 2-28 shows two diagrams (A and B), both of...Ch. 2 - Prob. 2.37PAECh. 2 - Review Figure 2-8LQ and Figure 2-22. Identify any...Ch. 2 - Prob. 2.39PAECh. 2 - Prob. 2.40PAECh. 2 - Prob. 2.41PAECh. 2 - Prob. 2.42PAECh. 2 - Prob. 2.43PAECh. 2 - Prob. 2.44PAECh. 2 - Prob. 2.45PAECh. 2 - Prob. 2.46PAECh. 2 - Prob. 2.47PAECh. 2 - Prob. 2.48PAECh. 2 - Draw an ERD for the following situation. (State...Ch. 2 - Prob. 2.50PAECh. 2 - Prob. 2.51PAECh. 2 - Review your answer to Problem and Exercise 2-49 if...
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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
- What is a strong entity type?arrow_forwardTalk about what weak and strong entity sets are.arrow_forwardAssuming that appropriate names are supplied for entity types, reference modes, and predicates and that appropriate constraints are added, which of the following conceptual schema diagrams are legal? Where illegal, briefly explain the error.arrow_forward
- Any weak entity set can be turned into a strong entity set by just adding the right properties. So, why are our entity sets so bad?arrow_forwardWhat is a Weak entity type?arrow_forwardThe property X can be found in two different entity sets A and B, but their names are unimportant for this discussion. How may the design be improved if the two Xs are unrelated?arrow_forward
- Explain the difference between a weak and a strong entity set.arrow_forwardWhere do object-oriented and entity-relationship models diverge in terms of the idea of an object?arrow_forwardHow does the concept of an object in the object oriented model differ from the concept of an entity in an entity relationship model?arrow_forward
- Create an Entity-Relationship model for the following descriptions: Doctors, nurses, and patients have the following unique numbers respectively: doctorNo, nurseNo, and patientNo.arrow_forwardWhat does the weak entity type really mean? What's the secret? Give an instance What does alternative specialization mean?How am I shown on the ER diagram? Give an example and create a diagram to match it.arrow_forwardStrongen a weak entity set by adding primary key attributes. Please explain our choice's overlap.arrow_forward
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