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Test your basic knowledge |
Data Modeling
Start Test
Study First
Subject
:
it-skills
Instructions:
Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. When a nonkey attribute is the determinate of a key attribute the table is in 3NF but not ____.
BCNF
Unary
Dependency
Numeric
2. _______ databases reflect the ever-growing demand for greater scope and depth in the data on which decision support systems increasingly rely.
Data warehouse
(1 - 1)
Weak
JOB_CHG_HOUR
3. 1NF - 2NF - and 3NF are _____.
Weak
Information
Mandatory
Normalization stages
4. Dependencies can be identified with the help of a dependency _____.
Relational table
Weak
Diagram
Normalization
5. Most designers consider the BCNF as a special case of the ____.
Relational models
Domain
Composite
3NF
6. The ___ refers to a specific table row as an entity instance.
(1 - 1)
ERM
Repeating group
Derived
7. Improving ___ leads to more flexible queries.
RDBMS
2NF
Multivalued dependencies
Atomicity
8. Any attribute whose value determines other values within a row is called ____.
RDBMS
BCNF
Determinant
(1 - 1)
9. If an employee within an EMPLOYEE entity has a relationship with itself - that relationship is known as a ____ relationship.
Recursive
Information
ERM
Prime
10. From a structural point of view - ______ is better than 1NF
Associative
3NF
2NF
Participation
11. Normalization represents a micro view of the ___ within the ERD.
Numeric
Entities
Data integrity problems
Determinant
12. The price paid for increased performance through denormalization is a larger amount of ____.
1NF
BCNF
Data redundancy
RDBMS
13. THE MOST LIKELY DATA TYPE FOR A SURROGATE KEY IS ____.
Data redundancy
Entities
Unnormalized
Numeric
14. In the ERD - Cardinality is indicated using the ___ notation.
Multivalued dependencies
Mandatory
(min - max)
BCNF
15. BCNF can be violated only if the table contains more than one ___ key.
Strong
Diagram
Candidate
Derived
16. In a ___ diagram - the arrows above the attribute indicate all desirable dependencies.
Partial dependencies
Weak
Database type
Dependency
17. Depicts all dependencies found within a given table structure is known as a ______.
Database type
Candidate
Domain
Dependency Diagram
18. The existence of a(n) ___ relationship indicated that the minimum cardinality is at least 1 for the mandatory entity.
Simple
Mandatory
Database type
Granularity
19. 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.
Information
Duplication
Temporary
Single-valued
20. Another word for existence-independent is ____.
Duplication
Temporary
Strong
BCNF
21. According to naming conventions described in Chapter 2 - ___ would be the best name for a column representing the charges per hour in a table named JOB.
Information
1NF
JOB_CHG_HOUR
Unnormalized
22. Dependencies based on only a part of a composite primary key are called ___ dependencies.
Detailed narrative
Partial
Ternary
Diagram
23. A ___ relationship exists when two entities are associated.
Binary
Candidate key
Detailed narrative
Normalization
24. In order to meet ___ requirements - you may have to denormalize some portion of the database.
Partial
Performance
Strong
Three
25. The word "entity" in the ER model corresponds to a _______.
Unnormalized
2NF
Table
Atomicity
26. 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
BCNF
BCNF
Normalization
27. A table that is in 2NF and contains no transitive dependencies is said to be in ___.
ERM
3NF
Composite
Dependency
28. The Crow's foot symbol with two parallel lines indicates ___ cardinality.
Detailed narrative
Database design
(1 - 1)
Temporary
29. The set of possible values for an attribute is a ____.
Surrogate
Domain
Partial dependencies
BCNF
30. A talbe is in 4NF if it is 3NF and has no ________.
Domain
Derived
Denormalization
Multivalued dependencies
31. A ___ entity has a primary key that is partially or totally derived from the parent entity in the relationship.
Weak
Information
Derived attribute
Duplication
32. ____ yields better performance.
Associative
Denormalization
Information
ERM
33. View the data as part of a table or collection of tables in which all key values must be identified.
Relational models
Candidate key
1NF
Composite
34. An ERM is not dependent on the ____________.
Mandatory
Database type
3NF
Granularity
35. A _____ entity is composed of the primary keys of each of the entities to be connected.
Partial
Derived
Associative
Detailed narrative
36. For most business transactional databases - we should normalize relations into ____.
BCNF
3NF
Unnormalized
Repeating group
37. The following step occurs first in the process of building an ERD: create a __________ of the organization's description of operations.
Single-valued
Detailed narrative
Weak
3NF
38. From a system functionality point of view - ___ attribute values can be calculated when they are needed to write reports or invoices.
Derived
Transitive dependency
Prime
Numeric
39. A ____ relationship exists when three entities are associated.
Repeating group
2NF
Ternary
Single-valued
40. A table is in BCNF if every determinant in the table is a ____________.
Relational models
Candidate key
Normalization stages
Candidate
41. An attribute that is part of a key is known as a ____ attribute.
Prime
3NF
Detailed narrative
Denormalization
42. In a real-world environment - changing granularity requirements might dictate changes in primary key selection - and those changes might ultimately require the use of ____ keys.
Determinant
Atomic attribute
Table
Surrogate
43. ______________database tables often lead to various data redundancy disasters in production databases.
2NF
(min - max)
Data warehouse
Unnormalized
44. ________ cannot be further subdivided.
Dependency Diagram
Multivalued dependencies
Atomic attribute
Atomicity
45. Relationship strength depends on how the primary key of the related entity is formulated - while the relationship ____ depends on how the business rule is written.
Data redundancy
Recursive
Participation
Unnormalized
46. A ___ identifier is composed of more than one attribute.
Entities
Composite
Atomicity
Relational models
47. A table where all attributes are dependent on the primary key are independent of each other - and no row contains two or more multivalued facts about an entity - is said to be in ____.
Prime
4NF
Partial dependencies
Information requirements
48. The conflicts between design efficiency - ____________ - and processing speed are often resolved through compromised that include denormalization.
Information requirements
Recursive
Mandatory
Numeric
49. Complex ____ requirements may dictate data transformations - and they may expand the number of entities and attributes withing the design.
Derived attribute
Information
Performance
Recursive
50. A ___ attribute is one that cannot be subdivided.
Mandatory
Simple
Performance
(min - max)