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