SUBJECTS
|
BROWSE
|
CAREER CENTER
|
POPULAR
|
JOIN
|
LOGIN
Business Skills
|
Soft Skills
|
Basic Literacy
|
Certifications
About
|
Help
|
Privacy
|
Terms
|
Email
Search
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. Dependencies can be identified with the help of a dependency _____.
Determinant
Relational table
Diagram
Candidate key
2. A ___________ must not contain a repeating group .
Relational table
Surrogate
Weak
Composite
3. __________ is a process to help reduce the likelihood of data anomalies.
Composite
Atomic attribute
Normalization
Mandatory
4. 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
Dependency
1NF
Dependency Diagram
5. In order to meet ___ requirements - you may have to denormalize some portion of the database.
Candidate
Performance
Transitive dependency
Candidate key
6. Most designers consider the BCNF as a special case of the ____.
3NF
Strong
Simple
Performance
7. A table where every determinant is a candidate key is said to be in ____.
Associative
Table
BCNF
3NF
8. From a structural point of view - ______ is better than 1NF
BCNF
2NF
Composite
Determinant
9. Any attribute whose value determines other values within a row is called ____.
Composite
Determinant
RDBMS
4NF
10. 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.
Dependency Diagram
Single-valued
Database type
Transitive dependency
11. A ______ attribute can have only one value.
Unnormalized
Information requirements
JOB_CHG_HOUR
Single-valued
12. The Crow's foot symbol with two parallel lines indicates ___ cardinality.
(1 - 1)
Detailed narrative
Atomic attribute
Unnormalized
13. The set of possible values for an attribute is a ____.
(min - max)
JOB_CHG_HOUR
Derived attribute
Domain
14. ____ yields better performance.
Denormalization
Unnormalized
Normalization stages
Performance
15. A _____ entity is composed of the primary keys of each of the entities to be connected.
Normalization stages
Database design
Atomicity
Associative
16. The existence of a(n) ___ relationship indicated that the minimum cardinality is at least 1 for the mandatory entity.
BCNF
Mandatory
Weak
2NF
17. Normalization represents a micro view of the ___ within the ERD.
Database design
Database type
Entities
Simple
18. THE MOST LIKELY DATA TYPE FOR A SURROGATE KEY IS ____.
Prime
Numeric
Atomicity
Three
19. 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
4NF
20. In order to meet performance requirements - you may have to denormalize portions of the ________.
Data redundancy
3NF
Data integrity problems
Database design
21. When a nonkey attribute is the determinate of a key attribute the table is in 3NF but not ____.
1NF
Relational table
BCNF
Information requirements
22. A table is in BCNF if every determinant in the table is a ____________.
Candidate key
Determinant
Simple
Denormalization
23. 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
Prime
2NF
Derived attribute
24. Another word for existence-independent is ____.
RDBMS
Atomicity
Strong
Candidate key
25. The following step occurs first in the process of building an ERD: create a __________ of the organization's description of operations.
Prime
Dependency
Relational models
Detailed narrative
26. If you have three different transitive dependencies - ___ different determinants exist.
Participation
BCNF
Three
Entities
27. A ___ identifier is composed of more than one attribute.
Relational table
Composite
Denormalization
JOB_CHG_HOUR
28. Refers to the level of detail represented by the values stored in a table's row
Relational table
1NF
Information requirements
Granularity
29. A ___ relationship exists when two entities are associated.
Repeating group
Binary
Weak
Table
30. _______ databases reflect the ever-growing demand for greater scope and depth in the data on which decision support systems increasingly rely.
Dependency
Data warehouse
Weak
Numeric
31. A ___ relationship exists when an association is maintained within a single entity.
Unary
Database type
Table
1NF
32. Data redundancy produces ____.
Data integrity problems
Derived attribute
Candidate
Associative
33. The conflicts between design efficiency - ____________ - and processing speed are often resolved through compromised that include denormalization.
3NF
Information requirements
Weak
Composite
34. A talbe is in 4NF if it is 3NF and has no ________.
Data warehouse
4NF
Weak
Multivalued dependencies
35. 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.
Mandatory
Repeating group
Composite
Weak
36. A ___ entity has a primary key that is partially or totally derived from the parent entity in the relationship.
Atomic attribute
Normalization stages
Weak
Numeric
37. 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.
Ternary
Numeric
JOB_CHG_HOUR
Partial dependencies
38. In the ERD - Cardinality is indicated using the ___ notation.
Atomicity
Temporary
ERM
(min - max)
39. ________ cannot be further subdivided.
Atomic attribute
Denormalization
Candidate
Normalization stages
40. 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
Prime
Atomicity
Composite
41. 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.
Composite
Data redundancy
Information
RDBMS
42. Data redundancies occur from ____ of data on every row entry.
Transitive dependency
Duplication
Dependency Diagram
Data redundancy
43. 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.
3NF
2NF
Temporary
Transitive dependency
44. 1NF - 2NF - and 3NF are _____.
4NF
Dependency
Normalization stages
1NF
45. Need not be stored physically in the data base.
Derived attribute
Candidate
Normalization
ERM
46. Dependencies based on only a part of a composite primary key are called ___ dependencies.
Unary
Partial dependencies
Relational table
Partial
47. A ____ relationship exists when three entities are associated.
Relational table
Ternary
Transitive dependency
Domain
48. ______________database tables often lead to various data redundancy disasters in production databases.
Unnormalized
Information
Mandatory
Candidate
49. A table that is in 2NF and contains no transitive dependencies is said to be in ___.
Candidate
3NF
2NF
Relational models
50. BCNF can be violated only if the table contains more than one ___ key.
Candidate
Normalization stages
Determinant
Atomicity