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