Deck 3: Data Modeling

Question 1

A database should have exactly the same number of tables as there are Classes in the Unified Modeling Language (UML)Class diagram from which the database is developed.

Answer 1

False

Question 2

Unified Modeling Language (UML)Class diagrams describe the logical structure of a database system.

Answer 2

True

Question 3

Obligatory business rules state what should not occur.

Answer 3

False

Question 4

In Unified Modeling Language (UML)foreign keys allow tables to be linked together in a database.

Question 5

In Unified Modeling Language (UML)the options for minimum multiplicity values are 0,1,and 2.

Question 6

In Unified Modeling Language (UML)the options for minimum multiplicity values are 1 and *.

Question 7

In Unified Modeling Language (UML)primary keys may be blank.

Question 8

In Unified Modeling Language (UML)the options for maximum multiplicity values are 1 and *.

Question 9

In Unified Modeling Language (UML)the options for maximum multiplicity values are 0 and *.

Question 10

Associations can indicate the roles that one Class takes in its business relationship with another Class.

Question 11

The Object Management Group maintains the standard for Unified Modeling Language (UML)Class diagrams.

Question 12

In Unified Modeling Language (UML)primary keys cannot by NULL.

Question 13

An aggregation relationship is a form of generalization relationships.

Question 14

When building a database from Unified Modeling Language (UML)Class diagrams,each instance of each Class becomes a row in the corresponding table.

Question 15

In Unified Modeling Language (UML)Class diagrams,Associations are represented by dashed lines.

Question 16

Business rules set criteria for branching in activity models.

Question 17

In Unified Modeling Language (UML)attributes are characteristics of individual instances of a Class.

Question 18

In Unified Modeling Language (UML)Class diagrams,a Class is represented by a rectangle.

Question 19

A generalization relationship models a grouping of things that share common characteristics.

Question 20

A Class is a separately identifiable collection of business relationships.

Question 21

Which of the following is not a best practice in preparing Unified Modeling Language (UML)Class diagrams?

A) Opt for simplicity.
B) Model each process separately.
C) Avoid crossing lines whenever possible.
D) Avoid confusing abbreviations.

Question 22

Consider an association between a Cash Disbursements class and a Vendors class in a Unified Modeling Language (UML)Class diagram.The multiplicities next to the Cash Disbursements class are 0..* and the multiplicities next to the Vendors class are 1..1.Which of the following is the best way to implement that association in your database?

A) Post the primary key of Cash Disbursements as a foreign key in Vendors.
B) Post the primary key of Vendors as a foreign key in Cash Disbursements.
C) Create a linking table.
D) None of the above.

Question 23

Entity-relationship diagrams (ERDs)are similar in content and purpose to Unified Modeling Language (UML)Class diagrams.Which of the following is not a basic building block of ERDs?

A) Relationships
B) Associations
C) Attributes
D) Entities

Question 24

Consider an association between a Deliveries class and a Shipping Companies class in a Unified Modeling Language (UML)Class diagram.The multiplicities next to the Deliveries class are 0..* and the multiplicities next to the Shipping Companies class are 1..1.Which of the following is the best way to implement that association in your database?

A) Post the primary key of Deliveries as a foreign key in Shipping Companies.
B) Post the primary key of Shipping Companies as a foreign key in Deliveries.
C) Create a linking table.
D) None of the above.

Question 25

Which of the following statements about foreign keys is not true?

A) A foreign key can be a combination of attributes.
B) A foreign key cannot be NULL.
C) Foreign key must match values of the linked primary key.
D) Foreign keys support a defined association.

Question 26

Consider an association between a Sales class and an Inventory class in a Unified Modeling Language (UML)Class diagram.The multiplicities next to the Sales class are 0..* and the multiplicities next to the Inventory class are 1..*.Which of the following is the best way to implement that association in your database?

A) Post the primary key of Sales as a foreign key in Inventory.
B) Post the primary key of Inventory as a foreign key in Sales.
C) Create a linking table.
D) None of the above.

Question 27

Consider an association between a Customers class and a Sale class in a Unified Modeling Language (UML)Class diagram.The multiplicities next to the Customers class are 1..1 and the multiplicities next to the Sale class are 0..*.Which of the following is the best way to implement that association in your database?

A) Post the primary key of Customers as a foreign key in Sales.
B) Post the primary key of Sales as a foreign key in Customers.
C) Create a linking table.
D) None of the above.

Question 28

Consider an association between a Cities class and a Neighborhoods class in a Unified Modeling Language (UML)Class diagram.The multiplicities next to the Cities class are 1..1 and the multiplicities next to the Neighborhoods class are 1..*.Which of the following is the best way to implement that association in your database?

A) Post the primary key of Cities as a foreign key in Neighborhoods.
B) Post the primary key of Neighborhoods as a foreign key in Cities.
C) Create a linking table.
D) None of the above.

Question 29

Which of the following is not a step in using a Unified Modeling Language (UML)Class model to prepare a database?

A) Map Classes to Tables.
B) Map Attributes to Table Fields.
C) Map Associations to Primary Keys.
D) Map Associations to Foreign Keys.

Question 30

Consider an association between a Pet Owners class and a Pets class in a Unified Modeling Language (UML)Class diagram.The multiplicities next to the Pet Owners class are 1..1 and the multiplicities next to the Pets class are 1..*.Which of the following is the best way to implement that association in your database?

A) Post the primary key of Pet Owners as a foreign key in the Pets.
B) Post the primary key of Pets as a foreign key in Pet Owners.
C) Create a linking table.
D) None of the above.

Question 31

Which of the following is not something a model of database structures must be able to describe?

A) The entities or things in the domain of interest
B) The sequence that entities are accessed
C) The cardinalities that describe how many instances of one entity can be related to another
D) The attributes or characteristics of the entities and relationships

Question 32

Which of the following best describes the purpose of a primary key?

A) Allows linking two or more tables
B) Indicates the minimum multiplicities for an association
C) Matches values of foreign keys in other classes
D) Uniquely identifies each instance of the class

Question 33

Which of the following is the best description of an association?

A) A group of classes
B) The lines in a UML Class diagram
C) The relationship between two classes
D) The number of times one class is related to another

Question 34

Consider an association indicating professional licensing status between an Accountant class and a States class in a Unified Modeling Language (UML)Class diagram.The multiplicities next to the Accountants class are 0..* and the multiplicities next to the States class are 0..*.Which of the following is the best way to implement that association in your database?

A) Post the primary key of Accountants as a foreign key in States.
B) Post the primary key of States as a foreign key in Accountants.
C) Create a linking table.
D) None of the above.

Question 35

Which of following are possible options for minimum multiplicities?

A) 0 and 1
B) 0 and *
C) * and 1
D) 0, 1, and *

Question 36

Which of the following is not a criterion for selection of a primary key?

A) The primary key cannot be NULL (blank).
B) The primary key should be controlled by the organization assigning it.
C) Primary keys with sequential values make it easier to spot gaps in the data.
D) Longer key values are better than shorter key values.

Question 37

Consider an association between a Cash Disbursements class and a Cash Accounts class in a Unified Modeling Language (UML)Class diagram.The multiplicities next to the Cash Disbursements class are 0..* and the multiplicities next to the Cash Accounts class are 1..1.Which of the following is the best way to implement that association in your database?

A) Post the primary key of Cash Disbursements as a foreign key in Cash Accounts.
B) Post the primary key of Cash Accounts as a foreign key in Cash Disbursements.
C) Create a linking table.
D) None of the above.

Question 38

Which of the following would be least likely to be represented with a Unified Modeling Language (UML)Class?

A) Trucks
B) The number of trucks used in the delivery
C) The employee driving the truck
D) The customer receiving the delivery

Question 39

Which of the following is a well-formed business rule?

A) Customers must be over 18 years of age.
B) Customers may not be under 18 years of age.
C) Customers must pay in U. S. dollars.
D) All of these are well-formed business rules.

Question 40

Which of the following is not a form of business rules?

A) Compulsory
B) Obligatory
C) Prohibited
D) Allowed

Question 41

List the tables with primary keys,attributes,and foreign keys that implement the following UML Class diagram given the accompanying list of attributes.

Question 42

Identify the classes and associations in the following narrative and draw a class diagram with multiplicities: Barb maintains a real estate tracking system for Orange County.There are currently 34 incorporated cities and 15 unincorporated communities in the county.Barb tracks all of these as cities.Within each city,there is at least one and could be many neighborhoods.Within each neighborhood,there is at least one and likely many houses.For each house,Barb tracks information for all the sales in the last 20 years,although some houses have not been sold in the last 20 years.

Question 43

Identify the classes and associations in the following narrative and draw a class diagram with multiplicities: To put himself through school,Zach operates an ice cream truck that travels through neighborhoods,ringing a bell to attract kids that want a cold ice cream treat.Zach's inventory includes many ice cream products and he tracks which items are sold in each sale.He occasionally adds new items to his list of ice cream products for sale.Zach only accepts cash for each sale.To identify the routes that generate the most sales,Zach summarizes sales by neighborhood but he only tracks neighborhoods with at least one sale.Zach deposits the cash received in his bank account at the end of each day.

Question 44

Identify the classes and associations in the following narrative and draw a class diagram with multiplicities: Dr.Jeff runs Fountain Valley Veterinary Clinic.He treats many animals and each animal is usually a pet belonging to one owner; however,Dr.Jeff sometimes treats injured animals even if the owner is unknown.In a typical visit to the clinic,each animal could receive one or more clinic services (such as tests,shots,and surgical treatments).The clinic collects one payment from the owner for all the clinic services performed in each visit.The owners pay for the visit when they pick up their pet,so the clinic does not track cash receipts separately.It only tracks pet visits and whether or not payment was received for that visit.Each payment is deposited into one clinic bank account.The clinic does not track which employee performs the services or collects payments.The clinic records information about the pets and their owners on their first visit.

Question 45

List the tables with primary keys,attributes,and foreign keys that implement the following UML Class diagram given the accompanying list of attributes.Identify primary keys with PK and foreign keys with FK.