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