Appendix C Test Bank Answers Baltzan

M: Information Systems, 5e (Baltzan)

Appendix C

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

2) 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.

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

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.

5) Date of birth would be a stored attribute.

6) 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

7) Which of the following is a type of attribute?

A) single-valued attribute

B) multi-valued attribute

C) null-valued attribute

D) all of these

8) What has only one value of each attribute of an entity?

A) single-valued attribute

B) multi-valued attribute

C) null-valued attribute

D) all of these

9) 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 these

10) 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

11) 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

12) What kind of attribute would be date of birth?

A) null-valued attribute

B) multi-valued attribute

C) derived attribute

D) stored attribute

13) What kind of attribute would be age?

A) null-valued attribute

B) multi-valued attribute

C) derived attribute

D) stored attribute

14) 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

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

A) attribute

B) entity

C) business relational diagram

D) business rule

16) 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 these are correct.

17) 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 these.

18) 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

19) 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

20) 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

21) 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

22) What expresses the specific number of instances in an entity?

A) cardinality

B) composite entity

C) business rule

D) null-valued attribute

23) What is a characteristic of a table?

A) field

B) table

C) record

D) key

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

A) field

B) table

C) record

D) key

25) What is a collection of related data elements?

A) field

B) table

C) record

D) key

26) 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

27) 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