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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. _______ databases reflect the ever-growing demand for greater scope and depth in the data on which decision support systems increasingly rely.
Simple
Data warehouse
Database type
Multivalued dependencies
2. Improving ___ leads to more flexible queries.
Atomicity
Binary
Candidate
Entities
3. A ___ entity has a primary key that is partially or totally derived from the parent entity in the relationship.
Ternary
Surrogate
Determinant
Weak
4. 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.
Participation
2NF
Dependency
Temporary
5. Most designers consider the BCNF as a special case of the ____.
Associative
Single-valued
3NF
Candidate key
6. A ___ derives its name from the fact that a group of multiple entries of the same type can exist for any single key attribute occurrence.
(1 - 1)
Duplication
Weak
Repeating group
7. Need not be stored physically in the data base.
Relational table
Binary
Mandatory
Derived attribute
8. For most business transactional databases - we should normalize relations into ____.
Binary
Composite
3NF
BCNF
9. A ______ attribute can have only one value.
RDBMS
Single-valued
Data redundancy
ERM
10. A table where every determinant is a candidate key is said to be in ____.
Entities
BCNF
Transitive dependency
Dependency
11. Depicts all dependencies found within a given table structure is known as a ______.
Information
Atomic attribute
Atomicity
Dependency Diagram
12. Data redundancies occur from ____ of data on every row entry.
Duplication
ERM
Mandatory
Determinant
13. The word "entity" in the ER model corresponds to a _______.
Multivalued dependencies
Transitive dependency
JOB_CHG_HOUR
Table
14. Dependencies can be identified with the help of a dependency _____.
Diagram
Data redundancy
Unary
ERM
15. From a structural point of view - ______ is better than 1NF
2NF
Strong
Granularity
Candidate
16. The following step occurs first in the process of building an ERD: create a __________ of the organization's description of operations.
Mandatory
Relational models
Weak
Detailed narrative
17. Complex ____ requirements may dictate data transformations - and they may expand the number of entities and attributes withing the design.
Unnormalized
Detailed narrative
Composite
Information
18. __________ is a process to help reduce the likelihood of data anomalies.
Normalization
Information
Single-valued
Information requirements
19. In a ___ diagram - the arrows above the attribute indicate all desirable dependencies.
Atomic attribute
Repeating group
Composite
Dependency
20. BCNF can be violated only if the table contains more than one ___ key.
Candidate
Table
JOB_CHG_HOUR
Ternary
21. In order to meet performance requirements - you may have to denormalize portions of the ________.
1NF
Database design
Derived attribute
3NF
22. A ___ relationship exists when an association is maintained within a single entity.
Denormalization
4NF
(1 - 1)
Unary
23. 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 ____.
Relational table
Information requirements
ERM
1NF
24. Normalization represents a micro view of the ___ within the ERD.
2NF
3NF
Entities
Strong
25. The set of possible values for an attribute is a ____.
Detailed narrative
Domain
Database design
Data integrity problems
26. Dependencies based on only a part of a composite primary key are called ___ dependencies.
ERM
Granularity
Partial
Duplication
27. 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 ____.
Repeating group
Denormalization
4NF
Transitive dependency
28. A ___ relationship exists when two entities are associated.
Composite
Information requirements
Diagram
Binary
29. Any attribute whose value determines other values within a row is called ____.
Temporary
Database type
(1 - 1)
Determinant
30. When a nonkey attribute is the determinate of a key attribute the table is in 3NF but not ____.
Atomicity
BCNF
Associative
Composite
31. The conflicts between design efficiency - ____________ - and processing speed are often resolved through compromised that include denormalization.
BCNF
Transitive dependency
Information requirements
Normalization stages
32. A ____ relationship exists when three entities are associated.
ERM
Dependency
Normalization stages
Ternary
33. An attribute that is part of a key is known as a ____ attribute.
BCNF
Binary
Single-valued
Prime
34. The existence of a(n) ___ relationship indicated that the minimum cardinality is at least 1 for the mandatory entity.
2NF
Prime
Derived
Mandatory
35. ______________database tables often lead to various data redundancy disasters in production databases.
BCNF
Unnormalized
Partial dependencies
ERM
36. The associative entity is also known as a ___ entity.
JOB_CHG_HOUR
Composite
Ternary
Dependency Diagram
37. 1NF - 2NF - and 3NF are _____.
Unary
4NF
Normalization stages
Denormalization
38. If an employee within an EMPLOYEE entity has a relationship with itself - that relationship is known as a ____ relationship.
Granularity
Recursive
Candidate key
Temporary
39. THE MOST LIKELY DATA TYPE FOR A SURROGATE KEY IS ____.
Information requirements
(min - max)
Numeric
Table
40. From a system functionality point of view - ___ attribute values can be calculated when they are needed to write reports or invoices.
Derived
Atomic attribute
Normalization
Dependency
41. A ___________ must not contain a repeating group .
Database design
Entities
Recursive
Relational table
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.
Data redundancy
Surrogate
Candidate key
Information requirements
43. A ___ attribute is one that cannot be subdivided.
Simple
Mandatory
3NF
Unnormalized
44. A table that is in 2NF and contains no transitive dependencies is said to be in ___.
3NF
Entities
Dependency
Temporary
45. An ERM is not dependent on the ____________.
RDBMS
Database type
Detailed narrative
Three
46. A ____ exists when there are functional dependencies such that Y is functionally dependent on X and Z is functionally dependent on Y - and X is the primary key.
Denormalization
Transitive dependency
Single-valued
Data warehouse
47. View the data as part of a table or collection of tables in which all key values must be identified.
Simple
3NF
Relational models
Domain
48. In the ERD - Cardinality is indicated using the ___ notation.
Information
3NF
Candidate key
(min - max)
49. A ___ identifier is composed of more than one attribute.
Strong
Composite
Diagram
RDBMS
50. The Crow's foot symbol with two parallel lines indicates ___ cardinality.
(1 - 1)
Three
Unnormalized
RDBMS