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