Modern Database Management
13th Edition
ISBN: 9780134792293
Author: Hoffer
Publisher: PEARSON
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Chapter 2, Problem 2.36PAE
Figure 2-28 shows two diagrams (A and B), both of which are legitimate ways to represent that a stock has a history of many prices. Which of the two diagrams do you consider a better way to model this situation and why?
Figure 2-28 E-R diagram for Problem and Exercises 2-36.
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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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- Entity-relationship diagrams have a specific function, which is explained below. And what kind of symbol is utilised to represent a relationship, and how does it function? In what way does the word "associative entity" convey that something is happening and what does it mean? Could you provide an example?arrow_forwardTo what end does one go about building an ER diagram conceptual model?arrow_forwardTransfer the following description into an ER Diagram: A company has one or more locations referred to as "Plants" (Plant-ID). Several plants are uniquely assigned to the same company code (CC-ID). Plants can have several storage locations (S-loc-#) in which the manufactured and purchased items are stocked, a storage location however, can only be assigned to one plant. A purchase organisation (PO-ID) can be assigned to several plants and a plant to several purchase organisations. A company code is related to one or more purchase organisations, the latter is uniquely related to a company code. A distribution channel (DC-#) can be assigned to several divisions (Div-ID), whereas a division is uniquely assigned to a distribution channel. A sales organisation (Sales-Org-ID) can have several distribution channels, whereas a distribution channel is uniquely assigned to a sales organisation. A company code can have several sales organizations. Sales organisations are assigned to one…arrow_forward
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- Q1. Draw an E-R Diagram for the following situation. At the university system each STUDENT must be assigned an ADVISOR who counsels students about degree requirements and helps students register for classes (COURSE). Each student must register (REGISTRATION) for classes with the help of an advisor, but if the student's assigned advisor is not available, the students may register with any advisor, We must keep track of students, the assigned advisor for each, and the name of the advisor with whom the students registered for the current term. Tips: Attributes of STUDENT include Student ID (the identifier), Name, and Major. Attributes of ADVISOR include Advisor ID (the identifier), Name, and Department. Attributes of COURSE include Course ID (the identifier), Title, and Credits. Attributes of REGISTRATION include Semester, and Year. Based on your background, think of logical and standard relationships between the given entities.arrow_forwardExplain the prototype model with a diagram. What are the advantages, disadvantages, and use of this modelarrow_forwardE-R model is an acronym for this. Encircle the correct choice. a. Entity reference model b. Event reaction model c. Entity-Relationship modelarrow_forward
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