Deck 4: Data Modeling and the Entity-Relationship Model

Question 1

An entity identifier can be either unique or nonunique.

Answer 1

True

Question 2

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

Answer 2

False

Question 3

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

Answer 3

False

Question 4

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

Question 5

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

Question 6

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

Question 7

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

Question 8

Subtype entities may be either exclusive or inclusive.

Question 9

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 10

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

Question 11

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

Question 12

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

Question 13

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

Question 14

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

Question 15

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

Question 16

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

Question 17

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

Question 18

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 19

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

Question 20

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

Question 21

Microsoft Access 2013 is only used to prototype databases where Microsoft Access itself will be the final DBMS.

Question 22

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 23

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) All of the above would be contained in a use case.

Question 24

Microsoft Access 2013 uses banded form and report editors.

Question 25

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 26

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) All of the above are stages in the development of a database system.

Question 27

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 28

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

A) Business rules
B) User interviews
C) Forms
D) Use cases
E) All of the above are sources for user requirements.

Question 29

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 30

Microsoft Access 2013 wizards allow easy mock-ups of forms and reports for prototyping.

Question 31

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 32

Microsoft Access 2013 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 33

Microsoft Access 2013 database files can be easily copied to create multiple copies of a database.

Question 34

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 35

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 36

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 37

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 38

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 39

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 40

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 41

Relationships with the degree 2 are often called ________ relationships.

Question 42

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 43

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

Question 44

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

Question 45

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 46

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

Question 47

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

Question 48

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

Question 49

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

Question 50

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 51

The Microsoft Access 2013 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 52

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 53

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

Question 54

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 55

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 56

An entity that must logically depend on another entity is called a(n)________ entity.

Question 57

The Microsoft Access 2013 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 58

________ constrain data values and the processing of the database.

Question 59

Microsoft Access can be used to prototype databases for which of the following DBMS products?

A) Microsoft Access
B) SQL Server
C) MySQL
D) Oracle Database
E) All of the above

Question 60

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 61

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

Question 62

Explain the ambiguity in the broad definition of a weak entity.

Question 63

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

Question 64

Explain maximum cardinality.

Question 65

Distinguish between an entity class and an entity instance.

Question 66

Distinguish between entity identifiers and keys.

Question 67

Explain minimum cardinality.

Question 68

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

Question 69

Microsoft Access 2013 can be used to prototype databases for ________.

Question 70

Microsoft Access 2013 database files can be easily ________ to create multiple copies of a database.

Question 71

Microsoft Access 2013 uses ________ form and report editors.

Question 72

________ can be used to build prototype databases.

Question 73

Microsoft Access 2013 ________ allow easy mock-ups of forms and reports for prototyping.

Question 74

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

Question 75

Distinguish between a data model and a database design.

Question 76

Describe the use of Microsoft Access as a prototyping tool.