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