Modern Database Management
13th Edition
ISBN: 9780134773650
Author: Hoffer
Publisher: PEARSON
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Chapter 2, Problem 2.10RQ
State three conditions that suggest the designer should model a relationship as an associative entity type.
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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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- Where do object-oriented and entity-relationship models diverge in terms of the idea of an object?arrow_forwardExamine the following entity relationship diagram, and select all statements that correctly describe this diagram. PHOTOGRAPHER PK PHOTOGRAPHER ID FIRST_NAME LAST_NAME ++ uses PK +PK,FK1 CAMERA MODEL NR PHOTOGRAPHER ID DESCRIPTION a. The CAMERA entity has a composite primary key. Ob. The existence of each CAMERA instance depends upon the existence of a PHOTOGRAPHER instance. c. Each CAMERA instance is associated with exactly one PHOTOGRAPHER instance. d. A PHOTOGRAPHER uses one or more CAMERAS. e. Both PHOTOGRAPHER and CAMERA are strong entities.arrow_forwardCreate an Entity-Relationship model for the following descriptions: Doctors, nurses, and patients have the following unique numbers respectively: doctorNo, nurseNo, and patientNo.arrow_forward
- Draw an Entity Relationship Diagram for the following scenario A, B, and C are entities. There is a relationship between all three, called D. For each A and B there is one C. For each B and C there can be many A’s. For each A and C, there is one B. Every time the relationship, D, is satisfied, a single value, “Note”, will be storedarrow_forwardIn a descriptive model, what are the primary elements that make up the structure?arrow_forwardWhat is a Weak entity type?arrow_forward
- Entity-Relationship Diagram (ERD) is one of the data modeling tools that provides a software engineer with the ability to represent data objects, their characteristics, and their relationships. Use an ERD to describe the following scenario. A teacher is identified by an ID number (TID), last name (LName), and first name (FName). A project is identified by a project ID (PID) and title (T). A student is identified by an ID number (SID), last name (LName), and first name (FName). A teacher can supervise zero, one, or many students and a student is supervised by one teacher. A teacher must propose one or many projects and every project is proposed by one teacher. A student must work on one project and every project is worked by only one student.arrow_forwardENHANCED CHEN METHODOLOGYEER MODEL3-25For a library, the entity type HOLDING has four sub-types: BOOK, AUDIO BOOK, DVD, and SOFTWARE. Draw a separate EER diagram segment for each of the following situations:a. At a given time, a holding must be exactly one of these subtypes.b. A holding may or may not be one of these subtypes. However, a holding that is one of these subtypes cannot at the same time be one of the other subtypes.c. A holding may or may not be one of these subtypes. On the other hand, a holding may be any two (or even four) of these subtypes at the same time.d. At a given time, a holding must be at least one of these subtypes. 3-26A bank has three types of accounts: checking, savings, and loan. Following are the attributes for each type of account:CHECKING: Acct No, Date Opened, Balance, Service ChargeSAVINGS: Acct No, Date Opened, Balance, Interest RateLOAN: Acct No, Date Opened, Balance, Interest Rate, PaymentAssume that each bank account must be a member of exactly one…arrow_forwardSUBJECT:SOFTWARE ENGINEERING I NEED THE ANSWER QUICKLY Q3. Consider the use-case description and domain model, which shows the navigability of the associations, for the video sales and rental shop application. Using only one boundary class, one control class and any of the entity classes specified in the domain model. Write the flow of events analysis for this use case and construct a sequence diagram that shows the objects required to realize this use case and the messages that are passed among the objects. State any assumptions that you need to make. Flow of events for Reserve Video (Staff scenario) Use Case Analysis: 1. The ReserveVideo Ul object displays the screen for reserving a video. 2. The user enters the member number and the movie ID. 3. The ReserveVideoUI asks the ReserveVideoMgr to reserve the indicated video . 4. Tile ReserveVideoMgr gets the list of rental copies for the movie from the MovieVideo object. 5. The ReserveVideoMgr searches through the list of rental…arrow_forward
- With examples, explain the distinctions between is-a relationship and has-a relationship.arrow_forwardDraw an EER diagram to represent the following situation: When appropriate, model an associative entity. A rental property would like to store information about TENANT, DEPENDENTs and Payment. The property would like to store information about Tenant: Unique Tenant Id, Tenant Name(first and last) , Address(Street, City, State) , Phonenumbers (country, Area, local), Email Address and House Type. A housetype can be a Townhouse, Apartment or Individual house. For a Apartment, we will store Unique Apart number, number of rooms; for an Individual house, we will store Unique House number, size of house. We will not store any additional information about Townhouse. Dependents are depended on the tenants. Dependent can be uniquely identified by their name. For PAYMENTs, the following information will be stored: a unique payment id, the Bank name associated with the form of payment used, and the account holder name. There are three different types of PAYMENTs: Card Payment, Cheque Payment, Bank…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
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Enhanced Entity Relationship Model; Author: Data Science Center;https://www.youtube.com/watch?v=ocQUtXPumdQ;License: Standard YouTube License, CC-BY