Deck 12: Designing Databases

Question 1

A field is composed of rows and columns that represent an entity.

Answer 1

False
A table is composed of rows and columns that represent an entity.

Question 2

What occurs when two entities can be related to each other in many instances?

A)One-to-one relationship
B)One-to-many relationship
C)Many-to-many relationship
D)Composite entity

Answer 2

C
This is the definition of a many-to-many relationship.

Question 3

Which of the following statements is accurate?

A)A correct business rule for one organization may not be correct for another organization.
B)Each business rule will have entities and sometimes even attributes.
C)A typical business may have hundreds of business rules.
D)All of the above.

Answer 3

D
All of the above are accurate.

Question 4

A one-to-many relationship occurs between two entities in which an instance of one entity can be related to only one instance of a related entity.

Question 5

What kind of attribute can be calculated using the value of another attribute?

A)Single-valued attribute
B)Multi-valued attribute
C)Derived attribute
D)Stored attribute

Question 6

Which of the following is a possible business rule?

A)A customer can purchase many DVDs
B)DVDs can be purchased by many customers
C)A DVD title can have many copies
D)All of the above

Question 7

A primary key is a field that uniquely identifies a given record in a table.

Question 8

Which of the following is a type of attribute?

A)Single-valued attribute
B)Multi-valued attribute
C)Null-valued attribute
D)All of the above

Question 9

What kind of attribute is assigned to an attribute when no other value applies or when a value is unknown?

A)Single-valued attribute
B)Multi-valued attribute
C)Derived attribute
D)Null-valued attribute

Question 10

What is a statement that defines an aspect of a business?

A)Attribute
B)Entity
C)Business relational diagram
D)Business rule

Question 11

What kind of attribute would be date of birth?

A)Null-valued attribute
B)Multi-valued attribute
C)Derived attribute
D)Stored attribute

Question 12

What occurs between two entities in which an instance of one entity can be related to only one instance of a related entity?

A)One-to-one relationship
B)One-to-many relationship
C)Many-to-many relationship
D)Composite entity

Question 13

What kind of attribute would be age?

A)Null-valued attribute
B)Multi-valued attribute
C)Derived attribute
D)Stored attribute

Question 14

What has only a single value of each attribute of an entity?

A)Single-valued attribute
B)Multi-valued attribute
C)Null-valued attribute
D)All of the above

Question 15

Date of birth would be a stored attribute.

Question 16

What occurs between two entities in which an instance of one entity can be related to many instances of a related entity?

A)One-to-one relationship
B)One-to-many relationship
C)Many-to-many relationship
D)Composite entity

Question 17

What has the potential to contain more than one value for an attribute?

A)Single-valued attribute
B)Multi-valued attribute
C)Null-valued attribute
D)All of the above

Question 18

A foreign key is a primary key of one table that appears as an attribute in another table and acts to provide a logical relationship between the two tables.

Question 19

What is a technique for documenting the entities and relationships in a database environment?

A)Entity-relationship diagram
B)Data model
C)Database
D)Relational database model

Question 20

What kind of attribute would be given for a person who does not have an email address?

A)Null-valued attribute
B)Multi-valued attribute
C)Single-valued attribute
D)Stored attribute

Question 21

What is a collection of related data elements?

A)Field
B)Table
C)Record
D)Key

Question 22

What is a primary key?

A)A field that uniquely identifies a given record in a table.
B)A primary key of one table that appears as an attribute in another table and acts to provide a logical relationship between the two tables.
C)A table that uniquely identifies a given record in a field.
D)A foreign key of one table that appears as an entity in another table and acts to provide a logical relationship between the two records.

Question 23

What expresses the specific number of instances in an entity?

A)Cardinality
B)Composite entity
C)Business rule
D)Null-valued attribute

Question 24

What exists to represent the relationship between two other entities?

A)One-to-one relationship
B)One-to-many relationship
C)Many-to-many relationship
D)Composite entity

Question 25

What is composed of rows and columns that represent an entity?

A)Field
B)Table
C)Record
D)Key

Question 26

What is a foreign key?

A)A field that uniquely identifies a given record in a table.
B)A primary key of one table that appears as an attribute in another table and acts to provide a logical relationship between the two tables.
C)A table that uniquely identifies a given record in a field.
D)A foreign key of one table that appears as an entity in another table and acts to provide a logical relationship between the two records.

Question 27

What is a characteristic of a table?

A)Field
B)Table
C)Record
D)Key