Modern Database Management
13th Edition
ISBN: 9780134773650
Author: Hoffer
Publisher: PEARSON
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Textbook Question
Chapter 2, Problem 2.30PAE
Are associative entities also weak entities? Why or why not? If yes, is there anything special about their "weakness"?
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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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- Create an Entity-Relationship model for the following descriptions: Doctors, nurses, and patients have the following unique numbers respectively: doctorNo, nurseNo, and patientNo.arrow_forwardSo could someone explain to me what weak entities are using simple crows foot erd diagrams?arrow_forwardMatch the term with its description by placing the letter of the definition in the space preceding the term. ✓ Attribute ✓ Entity ✓ Entity set ✓ One-to-many relationship ✓ Overlap constraint A. A property or description of an entity B. An association among two or more entities C. A collection of unique tuples D. An object in the real world that is distinguishable from other obje E. One entity can be associated with many of another entity F. Two or more subclasses can contain the same entity. G. A set of possible values for an attribute H.A collection of similar entitiesarrow_forward
- I nee help in this question of MCQ via the UML Picture. Q)What is the class relationship that best describes Car and Driver? Group of answer choices a)Car (whole) : Driver (Part) (Aggregation) b)Driver (whole) : Car (Part) (Aggregation) c)Car (whole) : Driver (Part) (Composition) d)Driver (whole) : Car (Part) (Composition) e)Car is associated to Driver f)None of the givenarrow_forwardThe participation of the weak entity in its relationship with the strong entity that defines it is Select one: O a. Exact Participation O b. Partial Participation O c. Soft Participation O d. Total Participationarrow_forwardIn what way is it different between a weak entity and a strong entity that must have a connection with another entity?arrow_forward
- An entity in A is associated with at most one entity in B. An entity in B, however, can be associated with any number (zero or more) of entities in A. What is the cardinality ratio? a. one to many b. many to one c. one to one d. many to manyarrow_forwardThere are certain constraints imposed by selection structures in computer programming, notwithstanding their use. The same procedure must be followed in all cases, whether dealing with consumers, online clients, or other sorts of transactions. Is it true that various criteria apply to various occupations? So, why are these structures so special? There are certain constraints imposed by selection structures in computer programming, notwithstanding their use. The same procedure must be followed in all cases, whether dealing with consumers, online clients, or other sorts of transactions. Is it true that various criteria apply to various occupations? So, why are these structures so special? There are certain constraints imposed by selection structures in computer programming, notwithstanding their use. The same procedure must be followed in all cases, whether dealing with consumers, online clients, or other sorts of transactions. Is it true that various criteria apply to…arrow_forwardDraw an Entity Relationship Diagram for all of those below. (a simple one) Each lecturer is identified by a unique number, name and phone. A lecturer teaches several courses, and for each course there is a unique code and title (not necessarily unique). There might be several lecturers in a course. Each course requires one or more text books. Each text book is used in at least one course. A text book is identified by a unique ISBN, and its title, authors, publisher and year of publication are known. Each course has a unique code. The bank has many customers. Every customer has at least one account with the bank. An account may be shared by several customers. Each customer has a unique number, type, the opening date and the balance. A flight carries many passengers on a specific airplane. Each airplane has a unique number, while each flight has a code (unique), destination and origin. A passenger has a name, passport number and nationalityarrow_forward
- The distinction between a weak and a strong entity set is best explained here.arrow_forwardImagine two entities A and B, each of which has the property X (among other names not relevant to this topic) among other properties. Can the design improve without connecting the two Xs?arrow_forwardWhere do object-oriented and entity-relationship models diverge in terms of the idea of an object?arrow_forward
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