Deck 6: Normalization of Database Tables

Question 1

Normalization is a very important database design ingredient,and the highest level is always the most desirable.

Answer 1

False

Question 2

Atomic attributes are attributes that can be further subdivided.

Answer 2

False

Question 3

A determinant is any attribute whose value determines other values within a column.

Answer 3

False

Question 4

A dependency of one nonprime attribute on another nonprime attribute is a partial dependency.

Question 5

Repeating groups must be eliminated by ensuring that each row defines a single entity.

Question 6

Relational models view data as part of a table or collection of tables in which all key values must be identified.

Question 7

All relational tables satisfy the 1NF requirements.

Question 8

Since a partial dependency can exist only if a table's primary key is composed of several attributes,if a table in 1NF has a single-attribute primary key,then the table is automatically in 2NF.

Question 9

The objective of normalization is to ensure that each table conforms to the concept of well-formed relations.

Question 10

Normalization works through a series of stages called normal forms.

Question 11

In the context of partial dependencies,data redundancies occur because every row entry requires duplication of data.

Question 12

Dependencies that are based on only a part of a composite primary key are called transitive dependencies.

Question 13

Denormalization produces a lower normal form.

Question 14

Data redundancy produces data anomalies.

Question 15

Reporting anomalies in a table can cause a multitude of problems for managers and can be fixed through application programming.

Question 16

Data stored at their highest level of granularity are said to be atomic data.

Question 17

In order to meet performance requirements,portions of the database design may need to be occasionally denormalized.

Question 18

It is possible for a table in 2NF to exhibit transitive dependency,where the primary key may rely on one or more nonprime attributes to functionally determine other nonprime attributes.

Question 19

Dependency diagrams are very helpful in getting a bird's­eye view of all the relationships among a table's attributes.

Question 20

Normalization is a process that is used for changing attributes to entities.

Question 21

An attribute that is part of a key is known as a(n)attribute.

A)important
B)nonprime
C)prime
D)entity

Question 22

The combination of normalization and ER modeling yields a useful ERD,whose entities can be translated into appropriate relationship structures.

Question 23

A table is in BCNF if every determinant in the table is a foreign key.

Question 24

A table that displays data redundancies yields .

A)consistencies
B)anomalies
C)fewer attributes
D)more entities

Question 25

From a structural point of view,2NF is better than .

A)1NF
B)3NF
C)4NF
D)BCNF

Question 26

Unnormalized database tables often lead to various data redundancy disasters in production databases.

Question 27

A(n)exists when there are functional dependencies such that XY is functionally dependent on WZ,X is functionally dependent on W,and XY is the primary key.

A)atomic attribute
B)repeating group
C)partial dependency
D)transitive dependency

Question 28

Some very specialized applications may require normalization beyond the .

A)1NF
B)2NF
C)3NF
D)4NF

Question 29

Attributes should clearly define participation,connectivity,and document cardinality.

Question 30

Normalization represents a micro view of the entities within the ERD.

Question 31

The advantage of higher processing speed must be carefully weighed against the disadvantage of data anomalies.

Question 32

A table that has all key attributes defined,has no repeating groups,and all its attributes are dependent on the primary key is said to be in .

A)1NF
B)2NF
C)3NF
D)4NF

Question 33

Normalization purity is often easy to sustain in the modern database environment.

Question 34

Of the following normal forms,is mostly of theoretical interest.

A)1NF
B)3NF
C)BCNF
D)DKNF

Question 35

A good relational DBMS excels at managing denormalized relations.

Question 36

Normalization works through a series of stages called normal forms.For most purposes in business database design,stages are as high as you need to go in the normalization process.

A)two
B)three
C)four
D)five

Question 37

Data redundancy produces .

A)slower lookups
B)robust design
C)efficient storage use
D)data integrity problems

Question 38

From a structural point of view,3NF is better than .

A)4NF
B)2NF
C)5NF
D)6NF

Question 39

Attribute A attribute B if all of the rows in the table that agree in value for attribute A also agree in value for attribute B.

A)determines
B)derives from
C)controls
D)owns

Question 40

A table is in fourth normal form if it is in third normal form and has no independent multivalued dependencies.

Question 41

When a table contains only one candidate key,are considered to be equivalent.

A)the 1NF and the 2NF
B)the 3NF and the BCNF
C)the 4NF and the 3NF
D)the BCNF and the DKNF

Question 42

BCNF can be violated only if the table contains more than one key.

A)primary
B)candidate
C)foreign
D)secondary

Question 43

Dependencies based on only a part of a composite primary key are known as dependencies.

A)primary
B)partial
C)incomplete
D)composite

Question 44

An atomic attribute .

A)cannot exist in a relational table
B)cannot be further subdivided
C)displays multiplicity
D)is always chosen to be a foreign key

Question 45

A relational table must not contain a(n).

A)entity
B)attribute
C)relationship
D)repeating group

Question 46

Granularity refers to .
A)the number of rows in a table

A)the size of a table
B)the level of detail represented by the values in a table's row
D)the number of attributes represented in a table

Question 47

Improving leads to more flexible queries.

A)atomicity
B)normalization
C)denormalization
D)derived attribute

Question 48

In a real-world environment,we must strike a balance between design integrity and .

A)robustness
B)flexibility
C)uniqueness
D)ease of use

Question 49

A table where all attributes are dependent on the primary key but are independent of each other,and no row contains two or more multivalued facts about an entity is said to be in .

A)1NF
B)2NF
C)3NF
D)4NF

Question 50

A(n)exists when there are functional dependencies such that Y is functionally dependent on X,Z is functionally dependent on Y,and X is the primary key.

A)partial dependency
B)repeating group
C)atomic attribute
D)transitive dependency

Question 51

A derives its name from the fact that a collection of multiple entries of the same type can exist for any single key attribute occurrence.

A)partial dependency
B)transitive dependency
C)repeating group
D)primary key

Question 52

A table where every determinant is a candidate key is said to be in .

A)BCNF
B)2NF
C)1NF
D)4NF

Question 53

If a table has multiple candidate keys and one of those candidate keys is a composite key,the table can have based on this composite candidate key even when the primary key chosen is a single attribute.

A)Boyce-Codd normal forms
B)redundancies
C)time-variances
D)partial dependencies

Question 54

In a(n)diagram,the arrows above the attributes indicate all desirable dependencies.

A)Chen
B)dependency
C)functionality
D)ER

Question 55

For most business transactional databases,we should normalize relations into .

A)1NF
B)2NF
C)3NF
D)6NF

Question 56

A table that is in 2NF and contains no transitive dependencies is said to be in .

A)1NF
B)2NF
C)3NF
D)4NF

Question 57

To generate a surrogate key,Microsoft Access uses a(n)data type.

A)character
B)sequence
C)AutoNumber
D)identity

Question 58

In a situation,one key determines multiple values of two other attributes and those attributes are independent of each other.

A)multivalued dependency
B)transitive dependency
C)partial dependency
D)functional dependency

Question 59

The most likely data type for a surrogate key is .

A)character
B)date
C)logical
D)numeric

Question 60

From a system functionality point of view,attribute values can be calculated when they are needed to write reports or invoices.

A)derived
B)atomic
C)granular
D)historical

Question 61

The problem with transitive dependencies is that they still yield data .

Question 62

A dependency based on only a part of a composite primary key is called a (n)_____ .

Question 63

The is central to a discussion of normalization.

Question 64

Because a partial dependency can exist only when a table's primary key is composed of several attributes,a table whose key consists of only a single attribute is automatically in 2NF once it is in 1NF.

Question 65

An attribute that cannot be further subdivided is said to display .

Question 66

In order to meet requirements,you may have to denormalize some portions of a database design.

Question 67

Data warehouse routinely uses structures in its complex,multilevel,multisource data environment.

A)1NF
B)2NF
C)3NF
D)4NF

Question 68

All relational tables satisfy the requirements.

Question 69

If database tables are treated as though they were files in a file system,the never has a chance to demonstrate its superior data-handling capabilities.

Question 70

Any attribute whose value determines other values within a row is known as a .

Question 71

Any attribute that is at least part of a key is known as a (n)_____ .

Question 72

An example of denormalization is using a denormalized table to hold report data.This is required when creating a tabular report in which the columns represent data that are stored in the table as rows.

A)transitive
B)3NF
C)component
D)temporary

Question 73

When designing a database,you should .

A)make sure that entities are in normal form before table structures are created
B)create table structures then normalize the database
C)only normalize the database when performance problems occur
D)consider more important issues such as performance before normalizing

Question 74

The price paid for increased performance through denormalization is a larger amount of .

Question 75

The conflicts between design efficiency,information requirements,and performance are often resolved through_____.

A)compromises that include normalization
B)conversion from 2NF to 3NF
C)compromises that include denormalization
D)conversion from 3NF to 4NF

Question 76

A table is in 4NF if it is in 3NF,and .

A)all attributes must be dependent on the primary key and must be dependent on each other
B)all attributes are unrelated
C)it has no multivalued dependencies
D)no column contains the same values

Question 77

refers to the level of detail represented by the values stored in a table's row.

Question 78

databases reflect the ever-growing demand for greater scope and depth in the data on which decision support systems increasingly rely.

A)Normalized
B)Data warehouse
C)Temporary
D)Report

Question 79

When designing a new database structure based on the business requirements of the end users,the database designer will construct a data model using a technique such as .

Question 80

is a process to help reduce the likelihood of data anomalies.