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