SUBJECTS
|
BROWSE
|
CAREER CENTER
|
POPULAR
|
JOIN
|
LOGIN
Business Skills
|
Soft Skills
|
Basic Literacy
|
Certifications
About
|
Help
|
Privacy
|
Terms
|
Email
Search
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. 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.
Numeric
Denormalization
Atomicity
JOB_CHG_HOUR
2. A ___ relationship exists when an association is maintained within a single entity.
Granularity
Unary
(min - max)
Participation
3. _______ databases reflect the ever-growing demand for greater scope and depth in the data on which decision support systems increasingly rely.
Prime
Data warehouse
Dependency Diagram
Binary
4. Data redundancies occur from ____ of data on every row entry.
Duplication
Granularity
Repeating group
Relational models
5. The ___ refers to a specific table row as an entity instance.
Information requirements
Prime
ERM
Numeric
6. Dependencies based on only a part of a composite primary key are called ___ dependencies.
Candidate
Atomicity
Partial
Database design
7. 1NF - 2NF - and 3NF are _____.
Data redundancy
Normalization stages
Ternary
Database type
8. Normalization represents a micro view of the ___ within the ERD.
Entities
Prime
Information requirements
Detailed narrative
9. A ___ relationship exists when two entities are associated.
Composite
3NF
Binary
Entities
10. Any attribute whose value determines other values within a row is called ____.
Information
Dependency Diagram
Determinant
Temporary
11. The existence of a(n) ___ relationship indicated that the minimum cardinality is at least 1 for the mandatory entity.
Dependency Diagram
Mandatory
3NF
Normalization stages
12. View the data as part of a table or collection of tables in which all key values must be identified.
Entities
Associative
BCNF
Relational models
13. 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.
Granularity
Atomicity
Temporary
Data redundancy
14. 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.
Repeating group
Information
Candidate
Database type
15. Improving ___ leads to more flexible queries.
3NF
Atomic attribute
Partial
Atomicity
16. A ____ relationship exists when three entities are associated.
Prime
Ternary
Surrogate
BCNF
17. 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.
Determinant
Partial dependencies
Normalization stages
Associative
18. 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 ____.
Multivalued dependencies
Prime
Temporary
4NF
19. If you have three different transitive dependencies - ___ different determinants exist.
Derived
Atomic attribute
3NF
Three
20. ____ yields better performance.
Database type
Strong
Denormalization
Relational table
21. When a nonkey attribute is the determinate of a key attribute the table is in 3NF but not ____.
Normalization
BCNF
Performance
Data warehouse
22. A ______ attribute can have only one value.
Three
Candidate key
Single-valued
Binary
23. A ___ attribute is one that cannot be subdivided.
Simple
Dependency Diagram
4NF
RDBMS
24. BCNF can be violated only if the table contains more than one ___ key.
Candidate
Entities
Database type
Performance
25. A table where every determinant is a candidate key is said to be in ____.
Derived
Associative
Composite
BCNF
26. __________ is a process to help reduce the likelihood of data anomalies.
Normalization
Entities
Duplication
Candidate
27. 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.
Transitive dependency
Performance
Information
Unary
28. 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.
Numeric
Performance
Surrogate
2NF
29. A table that is in 2NF and contains no transitive dependencies is said to be in ___.
Normalization
Determinant
Binary
3NF
30. An ERM is not dependent on the ____________.
Database type
Denormalization
Granularity
Determinant
31. A _____ entity is composed of the primary keys of each of the entities to be connected.
Dependency
Composite
Associative
4NF
32. A ___ identifier is composed of more than one attribute.
Binary
RDBMS
Associative
Composite
33. Most designers consider the BCNF as a special case of the ____.
JOB_CHG_HOUR
Normalization
3NF
Domain
34. Another word for existence-independent is ____.
Strong
Composite
Mandatory
Data integrity problems
35. Need not be stored physically in the data base.
ERM
Information requirements
Derived attribute
Database design
36. An attribute that is part of a key is known as a ____ attribute.
Determinant
Detailed narrative
Partial dependencies
Prime
37. In order to meet performance requirements - you may have to denormalize portions of the ________.
Diagram
JOB_CHG_HOUR
Three
Database design
38. The word "entity" in the ER model corresponds to a _______.
Data redundancy
Candidate
Table
Derived
39. The conflicts between design efficiency - ____________ - and processing speed are often resolved through compromised that include denormalization.
Composite
Surrogate
3NF
Information requirements
40. Dependencies can be identified with the help of a dependency _____.
Partial dependencies
Derived attribute
Diagram
Derived
41. Refers to the level of detail represented by the values stored in a table's row
Associative
Granularity
Temporary
Participation
42. In a ___ diagram - the arrows above the attribute indicate all desirable dependencies.
Domain
Atomicity
3NF
Dependency
43. 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 ____.
Determinant
Normalization stages
Unnormalized
1NF
44. The price paid for increased performance through denormalization is a larger amount of ____.
Data redundancy
Unnormalized
2NF
Multivalued dependencies
45. If an employee within an EMPLOYEE entity has a relationship with itself - that relationship is known as a ____ relationship.
Recursive
Candidate key
Information requirements
JOB_CHG_HOUR
46. In order to meet ___ requirements - you may have to denormalize some portion of the database.
Recursive
Data warehouse
Prime
Performance
47. The Crow's foot symbol with two parallel lines indicates ___ cardinality.
(1 - 1)
Numeric
Derived attribute
Associative
48. ________ cannot be further subdivided.
Atomic attribute
BCNF
Information requirements
Data redundancy
49. From a structural point of view - ______ is better than 1NF
Composite
Diagram
2NF
Transitive dependency
50. Depicts all dependencies found within a given table structure is known as a ______.
Table
JOB_CHG_HOUR
Relational table
Dependency Diagram