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