Modern Database Management
13th Edition
ISBN: 9780134773650
Author: Hoffer
Publisher: PEARSON
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Textbook Question
Chapter 4, Problem 4.12RQ
Describe how the following components of an E-R diagram are transformed into relations:
- regular entity type
- relationship (1: M)
- relationship (M:N)
- relationship (supertype/subtype)
- multivalued attribute
- weak entity
- composite attribute
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Chapter 4 Solutions
Modern Database Management
Ch. 4 - Define each of the following terms: determinant...Ch. 4 - Prob. 4.2RQCh. 4 - Prob. 4.3RQCh. 4 - Describe the primary differences between the...Ch. 4 - Summarize six important properties of relations.Ch. 4 - Describe two properties that each candidate key...Ch. 4 - Describe the three types of anomalies that can...Ch. 4 - Demonstrate each of the anomaly types with an...Ch. 4 - Fill in the blanks in each of the following...Ch. 4 - What is a well-structured relation? Why are...
Ch. 4 - Prob. 4.11RQCh. 4 - Describe how the following components of an E-R...Ch. 4 - Prob. 4.13RQCh. 4 - Prob. 4.14RQCh. 4 - Briefly describe four typical problems that often...Ch. 4 - Prob. 4.16RQCh. 4 - Explain how each of the following types of...Ch. 4 - Prob. 4.18RQCh. 4 - Prob. 4.19RQCh. 4 - Prob. 4.20RQCh. 4 - Prob. 4.21RQCh. 4 - What is the relationship between the primary key...Ch. 4 - Prob. 4.23RQCh. 4 - Explain what can be done with primary keys to...Ch. 4 - Prob. 4.25RQCh. 4 - Explain three conditions that suggest a surrogate...Ch. 4 - Prob. 4.27RQCh. 4 - For each of the following E-R diagrams from...Ch. 4 - Prob. 4.29PAECh. 4 - Prob. 4.30PAECh. 4 - For your answers to the following Problems and...Ch. 4 - Figure 4-3212 shows a class list for Millennium...Ch. 4 - Prob. 4.33PAECh. 4 - Prob. 4.34PAECh. 4 - Prob. 4.35PAECh. 4 - Prob. 4.36PAECh. 4 - Prob. 4.37PAECh. 4 - Prob. 4.38PAECh. 4 - Prob. 4.39PAECh. 4 - Transform Figure 2-15a, attribute version, to 3NF...Ch. 4 - The Public Safety office at Millennium College...Ch. 4 - Prob. 4.42PAECh. 4 - Prob. 4.43PAECh. 4 - Prob. 4.44PAECh. 4 - For your answers to Problem and Exercise 3-33 from...Ch. 4 - Prob. 4.46PAECh. 4 - Prob. 4.47PAECh. 4 - Figure 4-38 includes an EER diagram for a...Ch. 4 - Prob. 4.49PAECh. 4 - Prob. 4.50PAECh. 4 - Prob. 4.51PAECh. 4 - Prob. 4.52PAECh. 4 - Figure 4-40 shows an EER diagram for a university...Ch. 4 - Explore the data included in Table 4-9. Assume...Ch. 4 - Prob. 4.55PAECh. 4 - Prob. 4.56PAECh. 4 - Prob. 4.57PAECh. 4 - Prob. 4.58PAE
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- Data modelling is most often accomplished through the use of a(an) ________________. a. entity-relationship diagram b. data-flow diagram c. functional decomposition diagram d. activity diagramarrow_forwardData modeling is most often accomplished through the use of a(n) __________________. a. entity-relationship diagram b. data-flow diagram c. functional decomposition diagram d. activity diagramarrow_forwardUsing a graphics program, develop an entity-relationship diagram for a database application for an Internet bookstore where students buy textbooks from a salesperson and receive invoices for their purchases. Use Figure 5.5 as a guide.arrow_forward
- The ______________ model is a simple but highly useful way to organize data into collections of two-dimensional tables called relations.arrow_forwardWhen an attribute of one entity type references another entity type's attribute, this means that: O it is a derived attribute O weak entity type exists O a relationship exists O it means nothingarrow_forwardDraw an Entity Relationship Diagram for ther following information.arrow_forward
- When is it important to use an associative entity to express a many-to-many relationship?arrow_forwardIllustrate an Entity-Relationship Diagram (ERD) model using Crow’s Foot notation Here we can have the following entities 1.patients:this entity will store the details of the patients and the attributes for this entity is id(which is unique for each patient and can be used as a primary key) name(this attribute will store the name of the patient and it is a composite attribute) address(this attribute will store the address of the patient and it is multi valued attribute. ) contact_num(this is also a multi valued attribute which will store the contact details of the patient). age(which is a derived attribute) 2.room:this entity will store the information about the details of the rooms. The attributes are. id(this is unique for each room and can be used as a primary key) room number(this will store the room number) Total_bed(this will store the total number of beds present in that room) 3. Bed:this entity will store the information regarding to each bed present in an room, and the…arrow_forwardWhich of the following is a key part of conceptual design in an entity relationship model? This model uses column names instead of attributes. In this model, the characteristics such as location, path, and format are described. This model converts entities into tables. In this model, no primary keys are specified in the entities.arrow_forward
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