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