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