Deck 4: Data Modeling and the Entity Relationship Model

Question 1

In a 1:1 relationship,a single entity instance of one type is related to a single entity instance of the same or another type.

Answer 1

True

Question 2

An entity identifier can be either unique or nonunique.

Answer 2

True

Question 3

Subtype entities may be either exclusive or inclusive.

Answer 3

True

Question 4

Recursive relationships can be represented as 1:N or N:M,but not 1:1.

Question 5

The E-R Model assumes that all instances of a given entity class have the same attributes.

Question 6

The subtype symbol is a circle with a line under it.

Question 7

Maximum cardinality indicates whether or not an instance of one entity class must be related to at least one instance of another entity class.

Question 8

Recursive relationships occur when an entity has a relationship with ________.

Question 9

Which of the following is true about identifiers of entities?

A) Identifiers must be unique.
B) Identifiers are not normally used in a naming role.
C) The value of an identifier may identify a set of entity instances.
D) Identifiers may not be more than two attributes.
E) An identifier in the E-R model is equivalent to a key in the relational model.

Question 10

When an entity class has a relationship with itself,it is called a(n)________ relationship.

Question 11

There is usually only one instance of an entity in an entity class.

Question 12

Unified Modeling Language (UML)has quickly replaced the E-R Model as the most popular technique for creating data models.

Question 13

In the Entity-Relationship data model,all instances of an entity of a given type are grouped into ________.

A) entity objects
B) class objects
C) entity classes
D) identifiers
E) entity attributes

Question 14

The number of entity classes involved in a relationship is the cardinality of the relationship.

Question 15

One or more entities can be associated together in relationships.

Question 16

It is possible for an entity to have a relationship to itself.

Question 17

Which of the following is not a basic element of the E-R Model?

A) Identifiers
B) Entities
C) Cardinalities
D) Use cases
E) Relationships

Question 18

An entity class is described by the structure of the entities in that class.

Question 19

A PRODUCT entity instance is the collection of all PRODUCT entity classes.

Question 20

One type of strong entity is the ID-dependent entity.

Question 21

When developing a database system,the database is constructed during the implementation phase.

Question 22

Whether or not an instance of one entity class must participate in a relationship with another entity class is indicated by the ________.

A) degree
B) recursive cardinality
C) minimum cardinality
D) maximum cardinality
E) ordinality

Question 23

Relationships with the degree two are often called ________ relationships.

Question 24

Microsoft Access can be used to build a prototype database,which allows users ________.

A) to draw a crow's foot E-R diagram themselves
B) to normalize the tables in the E-R diagram
C) to validate the data model by demonstrating the consequences of data modeling decisions
D) to determine the functional dependencies in the data model
E) to determine the appropriate primary and foreign keys in the data model

Question 25

Identifiers of an entity that are composed of two or more attributes are called ________ identifiers.

Question 26

Which of the following activities is not performed during the implementation phase of developing a database system?

A) Filling the database with data
B) Transforming the data model into a database design
C) Writing application programs
D) Creating forms
E) Creating reports

Question 27

Distinguish between an entity class and an entity instance.

Question 28

________ constrain data values and the processing of the database.

Question 29

Use cases can be used to validate the data model,design,and implementation.

Question 30

The number of entity classes involved in a relationship is known as the relationship's ________.

A) maximum cardinality
B) minimum cardinality
C) ordinality
D) degree
E) class

Question 31

Microsoft Access is a good tool for creating mock-ups of forms and reports because ________.

A) the form and report generators do not exist within Access itself
B) Access forms and reports are very simplistic.
C) Access wizards make it easy to create the forms and reports.
D) Access has a version of Microsoft PowerPoint built into it to allow easy creation of PowerPoint slide shows.
E) Access has a version of Microsoft Excel built into it to allow easy exporting of data to spreadsheets.

Question 32

During the design phase of developing a database system,the users are asked about the need for changes to existing forms and reports.

Question 33

What are "business rules" and what is their role in database design?

Question 34

Which of the following is not a stage in the development of a database system?

A) Requirements analysis
B) Validation
C) Component design
D) Implementation
E) Both A and B

Question 35

A use case is a description of the way a user will employ the features and functions of the new system.

Question 36

An ID-dependent entity is ________.

A) a special type of weak entity
B) an entity in which the identifier of the entity includes the identifier of another entity
C) a strong entity
D) an entity with a maximum cardinality of one
E) Both A and B

Question 37

Changing aspects of a source document is much more difficult than changing the actual database,once constructed.

Question 38

Distinguish between entity identifiers and keys.

Question 39

During the implementation phase of developing a database system,the data model is transformed into a database design.

Question 40

Which of the following is not a source for user requirements during the requirements analysis stage of developing a database system?

A) Referential integrity constraints
B) User interviews
C) Forms
D) Use cases
E) Business Rules

Question 41

________ are descriptions of the ways users will employ the features and functions of the new information system.

Question 42

The Microsoft Access form editor is a(n)________.

A) banded form editor
B) wizard-based form editor
C) ASCII form editor
D) WYSIWYG form editor
E) Web-based form editor

Question 43

Explain minimum cardinality.

Question 44

Microsoft Access database files can be easily ________ to create multiple copies of a database.

Question 45

In crow's foot E-R notation,the hash mark indicates both a minimum cardinality of one and a maximum cardinality of one.

Question 46

Because of its forms and reports wizards,________ can be used to build a prototype database for many different other operational DBMS.

Question 47

In crow's foot style E-R diagrams,a hash mark across the relationship line near an entity indicates ________.

A) a minimum cardinality of zero
B) a minimum cardinality of one
C) a maximum cardinality of one
D) a maximum cardinality of many
E) Both B and C

Question 48

In crow's foot style E-R diagrams,a single entity together with a related set of entities that each contain specific sets of attributes related to the single entity represent ________.

A) a strong entity relationship
B) an ID-dependent weak entity relationship
C) a non-ID-dependent weak entity relationship
D) a supertype /subtype relationship
E) a recursive entity relationship

Question 49

In crow's foot E-R notation,the crow's foot indicates a maximum cardinality of one.

Question 50

In crow's foot E-R notation,a circle indicates a minimum cardinality of zero.

Question 51

Microsoft Access uses ________ form and report editors.

Question 52

Microsoft Access ________ allow easy mock-ups of forms and reports for prototyping.

Question 53

Describe the use of Microsoft Access as a prototyping tool.

Question 54

In crow's foot style E-R diagrams,a circle across the relationship line near an entity indicates ________.

A) a minimum cardinality of zero
B) a minimum cardinality of one
C) a maximum cardinality of one
D) a maximum cardinality of many
E) Both B and C

Question 55

The Microsoft Access report editor is a(n)________.

A) banded report editor
B) wizard-based report editor
C) ASCII report editor
D) WYSIWYG report editor
E) Web-based report editor

Question 56

In crow's foot style E-R diagrams,an entity class is represented by a(n)________.

Question 57

________ can be used to build prototype databases.

Question 58

In crow's foot style E-R diagrams,a crow's foot mark on the relationship line near an entity indicates ________.

A) a minimum cardinality of zero
B) a minimum cardinality of one
C) a maximum cardinality of one
D) a maximum cardinality of many
E) Both B and C

Question 59

Explain maximum cardinality.

Question 60

A(n)________ is a working demonstration of selected portions of the future system.

Question 61

A use case can be used to perform which of the following tasks?

A) Transform the data model into the database design
B) Validate the data model
C) Fill the database with data
D) Implement business rules
E) Develop applications

Question 62

The ________ is a representation of the content,relationships,and constraints of the data needed to support the system requirements.

Question 63

Given only the following excerpt of an E-R model:

Which of the following is known to be true?

A) There are more instances of ENTITY A than there are instances of ENTITY B in the user's environment.
B) A single instance of ENTITY B may be related to many instances of ENTITY A.
C) A single instance of ENTITY A must be related to many instances of ENTITY B.
D) ENTITY A has a minimum cardinality of one.
E) The degree of the relationship is "many."

Question 64

In a traditional E-R diagram,the relationship is symbolized by a diagram.

Question 65

Given only the following excerpt of an E-R model:

If one instance of ENTITY B must be related to one and only one instance of ENTITY A,and one instance of ENTITY A may be related to many instances of ENTITY B,which of the following should be written on the end of the relationship line next to ENTITY B in the figure above?

A)
B)
C)
D)
E) None of the above is correct.

Question 66

Given only the following excerpt of an E-R model:

Which of the following is known to be true?

A) A single instance of ENTITY A must be related to one instance of ENTITY B.
B) Many instances of ENTITY A may be related to one instance of ENTITY B.
C) ENTITY B has a degree of many.
D) ENTITY B is a weak entity.
E) Both A and C are true.

Question 67

Microsoft Access can be used to build a prototype database,which allows users to validate the data model by demonstrating the consequences of data modeling decisions.

Question 68

A nonidentifying relationship exists between an ID-dependent entity and its parent.

Question 69

A dashed line between entities indicates ________.

A) a unique identifier
B) a minimum cardinality of zero
C) a minimum cardinality of one
D) an identifying relationship
E) a nonidentifying relationship

Question 70

Microsoft Access is only used to prototype databases where Microsoft Access itself will be the final DBMS.

Question 71

Microsoft Access database files can be easily copied to create multiple copies of a database.

Question 72

What is a "use case" and how is it used?

Question 73

How is maximum cardinality expressed in crow's foot E-R diagrams?

Question 74

Distinguish between a data model and a database design.

Question 75

The representation of the content,relationships,and constraints of the data needed to support the system requirements is the ________.

A) relation design
B) implementation
C) data model
D) data view
E) application program

Question 76

Microsoft Access wizards allow easy mock-ups of forms and reports for prototyping.

Question 77

Which of the following would not be contained in a use case?

A) Inputs provided to the system to perform a task
B) A description of a task the user wants to perform
C) A prototype of the system performing a given task
D) Outputs generated by the system in performing a given task
E) An activity scenario

Question 78

System requirements as documented by use cases,business rules,forms,reports,and queries are sufficient to design the database without using a formal data model.

Question 79

Microsoft Access uses banded form and report editors.

Question 80

How is minimum cardinality expressed in crow's foot E-R diagrams?