Deck 6: Database Design 2: Design Method

Question 1

The second step in creating a user view is to represent the user view as a collection of tables.​

Answer 1

False

Question 2

The primary key is a unique identifier.​

Answer 2

True

Question 3

When you use an E-R diagram to represent a database,it visually illustrates all the information listed in the DBDL.​

Answer 3

True

Question 4

​Careful planning in the early stages of the normalization process will usually avoid the need to consider fourth normal form.

Question 5

In DBDL,you represent a table by listing all columns and then underlining the primary key.​

Question 6

The information-level design methodology involves representing the individual user view as a collection of tables,refining them to eliminate any problems,and then merging them into a cumulative design.

Question 7

The use of an "m" and an "n" in an E-R diagram indicates a many-to-many relationship.​

Question 8

A design that supports all user views is called a constructive design.​

Question 9

When you combine third normal form tables,the result will always be in third normal form.​

Question 10

​In an E-R diagram,a dashed line represents an identifying relationship and a solid line represents a nonidentifying relationship.

Question 11

The first step in creating a user view is to normalize the tables.​

Question 12

In an entity-relationship diagram,rectangles represent foreign keys.​

Question 13

When provided with a user view or some sort of stated requirement,you must develop a collection of tables that will support it.​

Question 14

In a one-to-many relationship,the primary key of the "many" table becomes the foreign key of the "one" table.​

Question 15

A weak entity is a column or collection of columns that could have been chosen as a primary key,but was not.​

Question 16

​There are two types of primary keys that you can use in your database design.

Question 17

Nulls are used when a value is either unknown or inapplicable.​

Question 18

The basic relationships among entities are: one-to-many,many-to-many,and one-to-one.​

Question 19

You create a many-to-many relationship by creating a new table whose primary key is the combination of the primary keys of the original tables.​

Question 20

​A foreign key is a column or collection of columns in one table that is required to match the value of the primary key for some row in another table,or be null.

Question 21

The type of information collected on the survey form that describes how data is updated is ____.​

A) ​Attribute information
B) ​Processing information
C) ​Relationships
D) ​Entity information

Question 22

The properties of the entities you choose as you design the user view will become the ____ in the appropriate tables.​

A) ​rows
B) ​columns
C) ​data
D) ​DBMS

Question 23

An alternative to the primary key of a table is listed with the ____ abbreviation in DBDL.​

A) ​SK
B) ​FK
C) ​PK
D) ​AK

Question 24

After the information-level design is completed,____ is the next step.​

A) ​The physical-level design
B) ​The modality-level design
C) ​The DBMS-level design
D) ​The table-level design

Question 25

Convert the following table to first normal form:​ Branch (BranchNum,BranchName,(BookCode,Title,OnHand))

A) ​Branch (BranchNum, BranchName)?Book (BookCode, Title)
B) ​Branch (BranchNum, BranchName)
C) ​Book (BookCode, Title)
D) ​Branch (BranchNum, BranchName, BookCode, Title, OnHand )

Question 26

If each employee works in a single department and each department has only one employee,the relationship between employees and departments is ____.​

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

Question 27

When implementing the physical-level design,for secondary keys,you must ensure that it is possible to retrieve data rapidly on the basis of a value of the ____ key.​

A) ​primary
B) ​secondary
C) ​alternate
D) ​foreign

Question 28

A(n)____ is a primary key that consists of a column that uniquely identifies an entity,such as a person's Social Security number.​

A) ​surrogate key
B) ​weak entity
C) ​artificial key
D) ​natural key

Question 29

When a DBMS creates a(n)____ key,it is usually an automatic numbering data type,such as the Access AutoNumber data type.​

A) ​surrogate
B) ​artificial
C) ​natural
D) ​logical

Question 30

Which of the following shows sample DBDL documentation for the Employee table?​

A) ​Employee (EmployeeNum, LastName, FirstName, Street, City, State, PostalCode)
B) ​Employee (EmployeeNum, LastName, FirstName, Street, City, State, PostalCode)
C) ​Employee (EmployeeNum, LastName, FirstName, Street, City, State, PostalCode, (WageRate, SocSecNum, DepartmentNum) )
D) ​Employee (EmployeeNum, LastName, FirstName, Street, City, State, PostalCode, WageRate, SocSecNum, DepartmentNum)
AK SocSecNum
SK LastName
FK DepartmentNum→Department

Question 31

The crucial issue in making the determination between a single many-to-many-to-many relationship and two (or three)many-to-many relationships is the ____.​

A) ​independence
B) ​data dependence
C) ​redundancy
D) ​cardinality

Question 32

Combining the following two tables would result in ____.​ Employee (EmployeeNum,LastName,FirstName,WageRate,SocSecNum,DepartmentNum)
Employee (EmployeeNum,LastName,FirstName,Street,City,State,PostalCode)

A) ​Employee (EmployeeNum, LastName, FirstName, WageRate, SocSecNum, DepartmentNum, (Street, City, PostalCode) )
B) ​Employee (EmployeeNum, LastName, FirstName, WageRate, SocSecNum, DepartmentNum, Street, City, State, PostalCode)
C) ​Employee (EmployeeNum, LastName, FirstName, Street, City State, PostalCode, WageRate, SocSecNum)
D) ​Employee (EmployeeNum, LastName, FirstName, WageRate, SocSecNum, DepartmentNum, EmployeeNum, LastName, FirstName, Street, City, State, PostalCode )

Question 33

When designing a database,you might find it helpful to design a(n)____ to obtain the required information from users.​

A) ​E-R diagram
B) ​table
C) ​report
D) ​survey form

Question 34

An entity that does not require a relationship to another entity for identification is called a(n)____.​

A) ​alternative entity
B) ​foreign entity
C) ​independent entity
D) ​single entity

Question 35

A column that you create for an entity to serve solely as the primary key and that is visible to users is called a(n)____.​

A) ​synthetic key
B) ​weak entity
C) ​artificial key
D) ​natural key

Question 36

A natural key is also called a(n)____ key.​

A) ​surrogate
B) ​intelligent
C) ​secondary
D) ​defining

Question 37

A relationship that is necessary for identification is called a(n)____.​

A) ​objectifying relationship
B) ​merging relationship
C) ​identifying relationship
D) ​referential relationship

Question 38

Independent entities have ____ in an E-R diagram​

A) dashed borders​
B) ​dark backgrounds
C) ​square corners
D) ​rounded corners

Question 39

A set of requirements that is necessary to support the operations of a particular database user is known as a(n)____.​

A) user view
B) ​user table
C) ​user attribute
D) ​user field

Question 40

A(n)____ is a system-generated primary key that is usually hidden from users.​

A) ​weak entity
B) ​surrogate key
C) ​natural key
D) ​artificial key

Question 41

In the ____________________ design method,specific user requirements are synthesized into a design.​

Question 42

On an E-R diagram,the number closest to the relationship represents ____ cardinality.​

A) ​maximum
B) ​minimum
C) ​midvalue
D) ​largest

Question 43

During the ____________________ design,designers must consider the characteristics of the particular DBMS that the organization will use.​

Question 44

____ means that an entity has a minimum cardinality of zero.​

A) ​The entity has a mandatory role in the relationship.
B) ​The entity is not required in the relationship.
C) ​The entity should not be in the relationship as an attribute.
D) ​The entity must be listed with all zeroes in the data fields.

Question 45

​An entity that exists to implement a many-to-many relationship is called a(n)____.

A) ​composite entity
B) ​complex entity
C) ​complicated entity
D) ​circular entity

Question 46

____ means that an entity has a minimum cardinality of one.​

A) ​The entity is required in the relationship.
B) ​The entity is not required in the relationship.
C) ​The entity should not be in the relationship as an attribute.
D) ​The entity must be listed with all ones in the data fields.

Question 47

In the standard E-R diagrams,relationships are drawn as ____,with lines connecting the entities involved in relationships.​

A) ​rectangles
B) ​diamonds
C) ​circles
D) ​squares

Question 48

Columns that are of interest strictly for the purpose of retrieval are known as ____________________.​

Question 49

On an E-R diagram,the number closest to the rectangle represents ____ cardinality.​

A) ​maximum
B) ​minimum
C) ​midvalue
D) ​smallest

Question 50

On an E-R diagram,____________________ entities have rounded corners.​

Question 51

The ____________________ design method begins with a general database design that models the overall enterprise and repeatedly refines the model to achieve a design that supports all necessary applications.​

Question 52

____________________ key restrictions determine the relationships between tables.​

Question 53

The style of E-R diagram used in the text is ____________________.​

Question 54

​A relationship that is not necessary for identification is called a(n)____________________ relationship.

Question 55

If a many-to-many-to-many relationship is created when it is not appropriate to do so,the conversion to ____ normal form will correct the problem.​

A) ​first
B) ​second
C) ​third
D) ​fourth

Question 56

It is through foreign keys that you can create relationships among tables and enforce certain types of ____________________ constraints in a database.​

Question 57

In IDEF1X,the ____ is the symbol for category.​

A) ​square
B) ​rectangle
C) ​diamond
D) ​circle

Question 58

A subtype is called a(n)____ in IDEF1X terminology.​

A) ​dependent
B) ​inner type
C) ​specification
D) ​category

Question 59

For each table,you must identify the primary key and any alternate keys,secondary keys,and ____________________ keys.​

Question 60

Complete categories are represented by ____ line(s)below the category symbol.​

A) ​one
B) ​two
C) ​three
D) ​four

Question 61

An entity-relationship (E-R)model is an approach to representing data in a(n)____________________.​

Question 62

One way to indicate a one-to-many relationship is to place a crow's foot at the ____________________ end of the relationship.​

Question 63

A(n)____________________ is a special value that represents the absence of a value in a field.​

Question 64

Describe the different types of primary keys.​

Question 65

An entity that depends on another entity for its own existence is called a(n)____________________.​

Question 66

List the types of information that must be included on a survey form in order for it to be considered valuable to the design process.​

Question 67

How can you attempt to avoid the problem of creating a table that is not in third normal form?​

Question 68

When the existence of one entity depends on the existence of another related entity,there is a(n)____________________.​

Question 69

A(n)____________________ is essentially both an entity and a relationship and is represented in an E-R diagram by a diamond within a rectangle.​

Question 70

____________________ refers to the number of items that must be included in a relationship.​

Question 71

A weak entity corresponds to the term ____________________.​

Question 72

List the steps that must be followed for each user view,as suggested by the information-level design methodology.​

Question 73

You can recognize entity subtypes by the fact the primary key is also a(n)____________________.​

Question 74

Explain the difference between a minimum cardinality of zero and a minimum cardinality of one.​

Question 75

To obtain information about ____________________ you might ask users questions such as: "If you know a particular employee number,can you establish other information,such as employee name?"​