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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. Data redundancy produces ____.
Multivalued dependencies
Data integrity problems
Dependency
2NF
2. A ___________ must not contain a repeating group .
Data warehouse
(min - max)
Relational table
Binary
3. In a ___ diagram - the arrows above the attribute indicate all desirable dependencies.
Composite
Unnormalized
Dependency
Numeric
4. A _____ entity is composed of the primary keys of each of the entities to be connected.
Temporary
Associative
4NF
Database design
5. 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.
Surrogate
Strong
Normalization
Composite
6. The word "entity" in the ER model corresponds to a _______.
Strong
3NF
Table
Numeric
7. A table that is in 2NF and contains no transitive dependencies is said to be in ___.
Denormalization
Partial dependencies
3NF
(1 - 1)
8. The price paid for increased performance through denormalization is a larger amount of ____.
Data redundancy
2NF
Table
4NF
9. Dependencies can be identified with the help of a dependency _____.
Diagram
Transitive dependency
Repeating group
Dependency
10. A table where every determinant is a candidate key is said to be in ____.
Dependency Diagram
BCNF
Data integrity problems
Mandatory
11. A talbe is in 4NF if it is 3NF and has no ________.
Multivalued dependencies
2NF
Normalization
Repeating group
12. A ___ relationship exists when an association is maintained within a single entity.
Dependency
Unary
Composite
Data warehouse
13. 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
Dependency
Domain
Temporary
14. The following step occurs first in the process of building an ERD: create a __________ of the organization's description of operations.
Determinant
Data warehouse
Entities
Detailed narrative
15. Dependencies based on only a part of a composite primary key are called ___ dependencies.
Database design
3NF
Partial dependencies
Partial
16. In the ERD - Cardinality is indicated using the ___ notation.
Strong
(min - max)
Normalization stages
Duplication
17. A ___ entity has a primary key that is partially or totally derived from the parent entity in the relationship.
Weak
Temporary
Transitive dependency
Ternary
18. ______________database tables often lead to various data redundancy disasters in production databases.
Granularity
Derived attribute
Unnormalized
Data redundancy
19. A table is in BCNF if every determinant in the table is a ____________.
Mandatory
JOB_CHG_HOUR
Composite
Candidate key
20. When a nonkey attribute is the determinate of a key attribute the table is in 3NF but not ____.
BCNF
Performance
Participation
JOB_CHG_HOUR
21. Any attribute whose value determines other values within a row is called ____.
Binary
Determinant
Prime
3NF
22. A ____ relationship exists when three entities are associated.
BCNF
(min - max)
Ternary
3NF
23. ____ yields better performance.
Entities
Binary
Candidate key
Denormalization
24. 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 ____.
4NF
Database design
Denormalization
Mandatory
25. 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.
RDBMS
Multivalued dependencies
Duplication
(1 - 1)
26. 1NF - 2NF - and 3NF are _____.
Binary
Entities
Relational models
Normalization stages
27. If you have three different transitive dependencies - ___ different determinants exist.
ERM
Performance
Numeric
Three
28. In order to meet ___ requirements - you may have to denormalize some portion of the database.
3NF
Associative
Performance
1NF
29. 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.
Weak
Unary
Partial dependencies
Entities
30. 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 ____.
Unnormalized
1NF
Atomicity
Data integrity problems
31. A ______ attribute can have only one value.
Single-valued
Denormalization
Candidate key
Atomicity
32. Most designers consider the BCNF as a special case of the ____.
Normalization
Composite
3NF
Relational table
33. A ___ relationship exists when two entities are associated.
Entities
Data warehouse
Binary
Participation
34. 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.
Dependency Diagram
Partial
Partial dependencies
Transitive dependency
35. View the data as part of a table or collection of tables in which all key values must be identified.
Relational models
Database type
Unnormalized
Granularity
36. A ___ attribute is one that cannot be subdivided.
3NF
Dependency Diagram
Simple
Information requirements
37. Refers to the level of detail represented by the values stored in a table's row
Granularity
Atomicity
Detailed narrative
Partial dependencies
38. Depicts all dependencies found within a given table structure is known as a ______.
Participation
Composite
Dependency Diagram
Ternary
39. For most business transactional databases - we should normalize relations into ____.
Composite
Information requirements
Prime
3NF
40. __________ is a process to help reduce the likelihood of data anomalies.
4NF
BCNF
Performance
Normalization
41. The Crow's foot symbol with two parallel lines indicates ___ cardinality.
Transitive dependency
ERM
(1 - 1)
Data integrity problems
42. Another word for existence-independent is ____.
Participation
Strong
Information requirements
Data redundancy
43. A ___ identifier is composed of more than one attribute.
Dependency
4NF
ERM
Composite
44. Normalization represents a micro view of the ___ within the ERD.
Entities
Transitive dependency
Repeating group
Unnormalized
45. From a system functionality point of view - ___ attribute values can be calculated when they are needed to write reports or invoices.
Diagram
Performance
Derived
Normalization stages
46. Need not be stored physically in the data base.
Derived attribute
4NF
Surrogate
BCNF
47. The ___ refers to a specific table row as an entity instance.
ERM
RDBMS
Normalization
Derived
48. Improving ___ leads to more flexible queries.
Dependency Diagram
2NF
Atomicity
Strong
49. The associative entity is also known as a ___ entity.
Atomic attribute
Partial
Composite
Entities
50. The conflicts between design efficiency - ____________ - and processing speed are often resolved through compromised that include denormalization.
Information
Partial dependencies
Information requirements
Strong