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