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