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