Deck 2: Modeling Data in the Organization

Question 1

The logical representation of an organization's data is called a(n):

A) database model.
B) entity-relationship model.
C) relationship systems design.
D) database entity diagram.

Answer 1

B

Question 2

An attribute that can be broken down into smaller parts is called a(n)________ attribute.

A) associative
B) simple
C) composite
D) complex

Answer 2

C

Question 3

An entity type whose existence depends on another entity type is called a ________ entity.

A) strong
B) weak
C) codependent
D) variant

Answer 3

B

Question 4

The common types of entities are:

A) strong entities.
B) weak entities.
C) associative entities.
D) all of the above.

Question 5

Customers,cars,and parts are examples of:

A) entities.
B) attributes.
C) cardinals.
D) relationships.

Question 6

Which of the following is an entity type on which a strong entity depends?

A) Owner
B) Member
C) Attribute
D) None of the above

Question 7

Which of the following is NOT a good characteristic of a data name?

A) Relates to business characteristics
B) Readable
C) Repeatable
D) Relates to a technical characteristic of the system

Question 8

In an E-R diagram,there are ________ business rule(s)for every relationship.

A) two
B) three
C) one
D) none

Question 9

A fact is an association between two or more:

A) words.
B) terms.
C) facts.
D) nuggets.

Question 10

A person's name,birthday,and social security number are all examples of:

A) attributes.
B) entities.
C) relationships.
D) descriptors.

Question 11

Data modeling may be the most important part of the systems development process because:

A) data characteristics are important in the design of programs and other systems components.
B) the data in a system are generally less complex than processes and play a central role in development.
C) data are less stable than processes.
D) it is the easiest.

Question 12

An entity type name should be all of the following EXCEPT:

A) concise.
B) specific to the organization.
C) as short as possible.
D) a singular noun.

Question 13

A good data definition will all of the characteristics of a data object EXCEPT:

A) subtleties.
B) examples.
C) who determines the value of the data.
D) who can delete the data.

Question 14

An attribute of an entity that must have a value for each entity instance is a(n):

A) optional attribute.
B) composite attribute.
C) required attribute.
D) fuzzy attribute.

Question 15

An attribute that must have a value for every entity (or relationship)instance is a(n):

A) composite attribute.
B) required attribute.
C) optional attribute.
D) multivalued attribute.

Question 16

A(n)________ is the relationship between a weak entity type and its owner.

A) member chain
B) identifying relationship
C) jump path
D) chain link

Question 17

A property or characteristic of an entity type that is of interest to the organization is called a(n):

A) attribute.
B) coexisting entity.
C) relationship.
D) cross-function.

Question 18

Which of the following is NOT a characteristic of a good business rule?

A) Declarative
B) Atomic
C) Inconsistent
D) Expressible

Question 19

A business rule:

A) defines or constrains some aspect of the business.
B) asserts business structure.
C) controls or influences the behavior of the business.
D) all of the above.

Question 20

The following figure shows an example of:

A) a one-to-many relationship.
B) a strong entity and its associated weak entity.
C) a co-dependent relationship.
D) a double-walled relationship.

Question 21

A student can attend five classes,each with a different professor.Each professor has 30 students.The relationship of students to professors is a ________ relationship.

A) one-to-one
B) many-to-many
C) one-to-many
D) strong

Question 22

Which of the following conditions should exist if an associative entity is to be created?

A) All the relationships for the participating entities are many-to-many.
B) The new associative entity has independent meaning.
C) The new associative entity participates in independent relationships.
D) All of the above.

Question 23

In the following diagram,which of the answers below is true?

A) Each patient has one or more patient histories.
B) Each patient has one and only one visit.
C) Each patient history belongs to one and only one patient.
D) Both A and C

Question 24

In the figure shown below,which of the following is true?

A) A person can marry at most one person.
B) A person has to be married.
C) A person can marry more than one person, but that person can only be married to one person.
D) A person can marry more than one person.

Question 25

A relationship between the instances of a single entity type is called a(n)________ relationship.

A) ternary
B) primary
C) binary
D) unary

Question 26

An attribute that uniquely identifies an entity and consists of a composite attribute is called a(n):

A) composite attribute.
B) composite identifier.
C) identifying attribute.
D) relationship identifier.

Question 27

For the relationship represented in the figure below,which of the following is true?

A) An employee can work in more than one department but does not have to work for any department.
B) A department must have at least one employee.
C) A department can have more than one employee.
D) An employee has to work for more than one department.

Question 28

A relationship where the minimum and maximum cardinality are both one is a(n)________ relationship.

A) optional
B) unidirectional
C) mandatory link
D) mandatory one

Question 29

In the following diagram,which is true?

A) It depicts a unary relationship.
B) It depicts a many-to-many relationship.
C) There is an associative entity.
D) All of the above.

Question 30

The number of entity types that participate in a relationship is called the:

A) number.
B) identifying characteristic.
C) degree.
D) counter.

Question 31

In the following diagram,what type of relationship is depicted?

A) Unary
B) Binary
C) Ternary
D) Quad

Question 32

A simultaneous relationship among the instances of three entity types is called a(n)________ relationship.

A) ternary
B) tertiary
C) primary
D) binary

Question 33

The following figure shows an example of:

A) a composite attribute.
B) a relational attribute.
C) a derived attribute.
D) a multivalued attribute.

Question 34

The total quiz points for a student for an entire semester is a(n)________ attribute.

A) derived
B) mixed
C) stored
D) addressed

Question 35

An entity that associates the instances of one or more entity types and contains attributes specific to the relationships is called a(n):

A) associative entity.
B) connecting entity.
C) intersectional entity.
D) all of the above.

Question 36

Which of the following criteria should be considered when selecting an identifier?

A) Choose an identifier that is stable.
B) Choose an identifier that will not be null.
C) Choose an identifier that doesn't have large composite attributes.
D) All of the above.

Question 37

An attribute that can be calculated from related attribute values is called a(n)________ attribute.

A) simple
B) composite
C) multivalued
D) derived

Question 38

In the figure below,which attribute is derived?

A) Years_Employed
B) Employee_ID
C) Skill
D) Address

Question 39

A ________ specifies the number of instances of one entity that can be associated with each instance of another entity.

A) degree
B) cardinality constraint
C) counter constraint
D) limit

Question 40

In the figure below,which attribute is multivalued?

A) Years_Employed
B) Employee_ID
C) Skill
D) Address

Question 41

Business rules are formulated from a collection of business ramblings.

Question 42

In an E-R Diagram,strong entities are represented by double-walled rectangles.

Question 43

While business rules are not redundant,a business rule can refer to another business rule.

Question 44

A value that indicates the date or time of a data value is called a(n):

A) value stamp.
B) time stamp.
C) checkpoint.
D) check counter.

Question 45

A mutually exclusive relationship is one in which:

A) an entity instance can participate in many different relationships.
B) an entity instance can participate in only one of several alternative relationships.
C) an entity instance can not participate in a relationship with another entity instance.
D) none of the above.

Question 46

Most systems developers believe that data modeling is the least important part of the systems development process.

Question 47

The purpose of data modeling is to document business rules about processes.

Question 48

In an E-R Diagram,an associative entity is represented by a rounded rectangle.

Question 49

In the following diagram,which answer is true?

A) Each employee can supervise one to many employees.
B) Each employee can manage many departments.
C) Each employee works in more than one department.
D) All of the above.

Question 50

A business rule is a statement that defines or constrains some aspect of the business.

Question 51

Data rather than processes are the most complex aspects of many modern information systems.

Question 52

In the figure shown below,which of the following business rules would apply?

A) Each vendor can supply many parts to any number of warehouses, but need not supply any parts.
B) Each part must be supplied by exactly one vendor to any number of warehouses.
C) Each warehouse can be supplied with any number of parts from more than one vendor, and each warehouse could be supplied with no parts.
D) None of the above.

Question 53

Enforcement of business rules can be automated through the use of software tools that can interpret the rules and enforce them.

Question 54

A business rule should be internally consistent.

Question 55

The intent of a business rule is to break down business structure.

Question 56

When systems are automatically generated and maintained,quality is diminished.

Question 57

The E-R model is used to construct a conceptual model.

Question 58

A business rule is a statement of how a policy is enforced or conducted.

Question 59

One of the roles of a database analyst is to identify and understand rules that govern data.

Question 60

Data names should always relate to business characteristics.

Question 61

When choosing an identifier,choose one that will not change its value often.

Question 62

It is desirable that no two attributes across all entity types have the same name.

Question 63

Some examples of attributes are: eye_color,weight,student_id,student.

Question 64

An entity type name should always be a singular noun.

Question 65

Data names do not have to be unique.

Question 66

A fact is an association between two or more terms.

Question 67

A relationship instance is an association between entity instances where each relationship instance includes exactly one entity from each participating entity type.

Question 68

The relationship between a weak entity type and its owner is an identifying relationship.

Question 69

A good data definition is always accompanied by diagrams,such as the entity-relationship diagram.

Question 70

A single occurrence of an entity is called an entity instance.

Question 71

An affirmative entity is also called a relationship entity.

Question 72

An entity type on which a strong entity is dependent is called a covariant entity.

Question 73

The name used for an entity type should never be the same in other E-R diagrams on which the entity appears.

Question 74

In the figure below,one might want to create a single-attribute surrogate identifier to substitute for the composite identifier.

Question 75

An example of a term would be the following sentence: "A student registers for a course."

Question 76

A multivalued attribute may take on more than one value for a particular entity instance.

Question 77

An entity is a person,place,object,event,or concept in the user environment about which the organization wishes to maintain data.

Question 78

It is not permissible to associate attributes with relationships.

Question 79

An attribute whose values can be calculated from related attribute values is called a derived attribute.

Question 80

A simple attribute can be broken down into smaller pieces.