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