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_forwardBased on Entity Relationship Diagram (ERD) below; a) Write the correct business rules for all entities. b) Write the suitable relationship name for (a) and (b). RESERVATION GUEST ROOM PK RSV_ID PK GUEST_ID RSV_DATE PK ROOM_ID GUEST_NAME ARRIVAL_DATE (b) ROOM_TYPE GUEST_PHONENO (a) DEPART_DATE ROOM_RATE GUEST_ADDRESS NO_OF_GUESTS FK1 RSV_ID NO_OF_ROOMS FK1 GUEST_IDarrow_forwardIn what way is it different between a weak entity and a strong entity that must have a connection with another entity?arrow_forward
- What distinguishesa weak entity from a strong entity that has a required relationshipto another entity?arrow_forwardPlease provide a definition of an entity-relationship model as well as an explanation of how it works.arrow_forwardPrepare an E-R diagram for a real estate firm that lists property for sale. Identify all entities (supertype/subtype), attributes (optional/required), unique identifiers, relationships and relationships cardinality and optionality. Resolve any M-M relationship you find. • The firm has several sales offices in several states. Each sales office has Office_Number and a Location. • Employees are assigned to work in different sales offices. Each employee has an ID and Name. • An employee must be assigned to only one sales office. For each sales office, there is always one employee assigned to manage that office. For each manager we record the start date of the management job. • The firm lists properties for sale. Each property has an ID, description and Location. Each unit of property must be listed with one (and only one) of the sales offices. A sales office may have any number of properties listed. • Each unit of property has one or more owners. owners have ID and Name. An owner may own…arrow_forward
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