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