Database Ch 5

1. A table is in fourth normal form if it is in third normal form and has no multiple sets of multivalued dependencies.

True

False

2. Dependencies can be identified with the help of the dependency diagram.

True

False

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

True

False

4. A table is in 2NF if it is in 1NF and it includes no partial dependencies.

True

False

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

True

False

6. Normalization should be part of the design process.

True

False

7. Normalization works through a series of stages called normal forms.

True

False

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

True

False

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

1NF

3NF

4NF

BCNF

10. It is possible for a table in 2NF to exhibit transitive dependency, where one or more attributes may be functionally dependent on non-key attributes.

True

False

11. 1NF, 2NF, and 3NF are ____.

Normalization stages

Anomalies

Repeating groups

Atomic attributes

12. All relational tables satisfy the 1NF requirements.

True

False

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

True

False

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

True

False

15. Repeating groups must be eliminated by making sure that each row defines a single entity.

True

False

16. In order to meet performance requirements, you may have to denormalize portions of the database design.

True

False

17. Data redundancies are caused by the fact that every row entry requires duplication of data.

True

False

18. ____ is not a valid normal form.

1NF

BCNF

3NF

MVNF

19. Dependencies based on only a part of a composite primary key are called ____ dependencies.

Primary

Partial

Incomplete

Composite

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

True

False

21. Normalization works through a series of stages called normal forms. Typically ____ stages are processed.

Two

Three

Four

Five

22. Of the following ____ would be the best name for a column representing the charges per hour in a table named JOB.

JOB_CHG_HOUR

CHARGES_PER_HOUR_FOR_JOB

CHARGES_PER_HOUR

CHG_HR

23. Denormalization produces a lower normal form.

True

False

24. Converting a database format from 1NF to 2NF is a complex process.

True

False

25. Granularity refers to ____.

The size of a table

The level of detail represented by the values stored in a table's row

The number of attributes in a table

The number of rows in a table

26. A table that displays data redundancies yields ____.

Consistencies

Anomalies

Fewer attributes

More entities

27. Given the table EMP_PROJ (PROJ_NUM, EMP_NUM, PROJ_NAME, EMP_NAME, JOB_CLASS, CHG_HOURS, HOURS), of the following,____, is a partial dependency.

PROJ_NUM --> PROJ_NAME

JOB_CLASS --> CHG_HOUR

PROJ_NUM, EMP_NUM --> HOURS

PROJ_NUM, EMP_NUM --> CHG_HOURS

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

BCNF

2NF

3NF

4NF

29. A relation is not in 1NF if ____.

It has multiple candidate keys

All of the key attributes are defined

There are repeating groups in the table

All attributes are dependent on the primary key

30. A table that is in 1NF and includes no partial dependencies only is said to be in ____.

BCNF

2NF

3NF

4NF

31. An atomic attribute ____.

Cannot exist in a relational table

Cannot be further subdivided

Displays multiplicity

Is always chosen to be a foreign key

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

Robustness

Flexibility

Uniqueness

Ease of use

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

1NF

2NF

3NF

6NF

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

True

False

35. 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.

Determines

Derives from

Controls

Owns

36. If you have three different transitive dependencies ____ different determinant(s) exist.

One

Two

Three

Four

37. Data redundancy produces ____.

Slower lookups

Robust design

Efficient storage use

Data integrity problems

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

Chen

Dependency

Functionality

ER

39. A(n) ____ should not be placed in a relational table.

Entity

Attribute

Relationship

Repeating group

40. Atomic attributes are attributes that can be further divided.

True

False

41. When designing a database, you should ____.

Make sure entities are in normal form before table structures are created

Create table structures then normalize the database

Only normalize the database when performance problems occur

Consider more important issues such as performance before normalizing

42. Normalization produces a lower normal form.

True

False

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

Important

Nonprime

Prime

Entity

44. Normalization represents a micro view of the ____ within the ERD.

Entities

Attributes

Relationships

Forms

45. 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 ____.

1NF

2NF

3NF

4NF

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

Surrogate

Sequence

AutoNumber

Identity

47. Most designers consider the BCNF as a special case of the ____.

1NF

2NF

3NF

4NF

48. From a strictly database point of view, ____ attribute values can be calculated when they are needed to write reports or invoices.

Derived

Atomic

Granular

Historical

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

Primary

Candidate

Foreign

Secondary

50. The conflicts between design efficiency, information requirements, and processing speed are often resolved through ____.

Conversion from 1NF to 2NF

Conversion from 2NF to 3NF

Compromises that include denormalization

Conversion from 3NF to 4NF

51. ____ yields better performance.

Denormalization

Normalization

Atomization

Compression

52. Converting a ____ is not an example of denormalization.

3NF to 2NF

2NF to 1NF

3NF to 1NF

3NF to BCNF

53. The most likely data type for a surrogate key is ____.

Character

Date

Logical

Numeric

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

Normalized

Data warehouse

Temporary

Report

55. A table is in 4NF if ____.

All attributes must be dependent on the primary key, and must be dependent on each other

All attributes are unrelated

No row can contain two or more multivalued facts about an entity.

No column contains the same values

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

True

False

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

1NF

2NF

3NF

4NF

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

True

False

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

True

False

60. Improving ____ leads to more flexible queries.

Atomicity

Normalization

Denormalization

Derived attributes

61. Some very specialized applications may require normalization beyond the ____.

1NF

2NF

3NF

4NF

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

True

False

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

3NF

1NF

BCNF

DKNF

64. Repeating groups must be eliminated by making sure that each column defines a single entity.

True

False

65. 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 is stored in the table as rows.

Transitive

3NF

Component

Temporary

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

True

False

67. A good relational DBMS excels at managing denormalized relations.

True

False

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

True

False

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

True

False

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

1NF

2NF

3NF

4NF

Database Ch 5

1. A table is in fourth normal form if it is in third normal form and has no multiple sets of multivalued dependencies.

2.

What first name or nickname would you like us to use?

2. Dependencies can be identified with the help of the dependency diagram.

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

4. A table is in 2NF if it is in 1NF and it includes no partial dependencies.

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

6. Normalization should be part of the design process.

7. Normalization works through a series of stages called normal forms.

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

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

10. It is possible for a table in 2NF to exhibit transitive dependency, where one or more attributes may be functionally dependent on non-key attributes.

11. 1NF, 2NF, and 3NF are ____.

12. All relational tables satisfy the 1NF requirements.

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

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

15. Repeating groups must be eliminated by making sure that each row defines a single entity.

16. In order to meet performance requirements, you may have to denormalize portions of the database design.

17. Data redundancies are caused by the fact that every row entry requires duplication of data.

18. ____ is not a valid normal form.

19. Dependencies based on only a part of a composite primary key are called ____ dependencies.

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

21. Normalization works through a series of stages called normal forms. Typically ____ stages are processed.

22. Of the following ____ would be the best name for a column representing the charges per hour in a table named JOB.

23. Denormalization produces a lower normal form.

24. Converting a database format from 1NF to 2NF is a complex process.

25. Granularity refers to ____.

26. A table that displays data redundancies yields ____.

27. Given the table EMP_PROJ (PROJ_NUM, EMP_NUM, PROJ_NAME, EMP_NAME, JOB_CLASS, CHG_HOURS, HOURS), of the following,____, is a partial dependency.

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

29. A relation is not in 1NF if ____.

30. A table that is in 1NF and includes no partial dependencies only is said to be in ____.

31. An atomic attribute ____.

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

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

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

35. 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.

36. If you have three different transitive dependencies ____ different determinant(s) exist.

37. Data redundancy produces ____.

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

39. A(n) ____ should not be placed in a relational table.

40. Atomic attributes are attributes that can be further divided.

41. When designing a database, you should ____.

42. Normalization produces a lower normal form.

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

44. Normalization represents a micro view of the ____ within the ERD.

45. 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 ____.

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

47. Most designers consider the BCNF as a special case of the ____.

48. From a strictly database point of view, ____ attribute values can be calculated when they are needed to write reports or invoices.

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

50. The conflicts between design efficiency, information requirements, and processing speed are often resolved through ____.

51. ____ yields better performance.

52. Converting a ____ is not an example of denormalization.

53. The most likely data type for a surrogate key is ____.

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

55. A table is in 4NF if ____.

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

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

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

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

60. Improving ____ leads to more flexible queries.

61. Some very specialized applications may require normalization beyond the ____.

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

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

64. Repeating groups must be eliminated by making sure that each column defines a single entity.

65. 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 is stored in the table as rows.

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

67. A good relational DBMS excels at managing denormalized relations.

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

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

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