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