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