Test your basic knowledge |

Data Modeling

Subject : it-skills
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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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. Need not be stored physically in the data base.

2. Depicts all dependencies found within a given table structure is known as a ______.

3. For most business transactional databases - we should normalize relations into ____.

4. From a system functionality point of view - ___ attribute values can be calculated when they are needed to write reports or invoices.

5. ______________database tables often lead to various data redundancy disasters in production databases.

6. An attribute that is part of a key is known as a ____ attribute.

7. An ERM is not dependent on the ____________.

8. __________ is a process to help reduce the likelihood of data anomalies.

9. 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.

10. The following step occurs first in the process of building an ERD: create a __________ of the organization's description of operations.

11. Complex ____ requirements may dictate data transformations - and they may expand the number of entities and attributes withing the design.

12. The conflicts between design efficiency - ____________ - and processing speed are often resolved through compromised that include denormalization.

13. The Crow's foot symbol with two parallel lines indicates ___ cardinality.

14. Another word for existence-independent is ____.

15. The existence of a(n) ___ relationship indicated that the minimum cardinality is at least 1 for the mandatory entity.

16. A _____ entity is composed of the primary keys of each of the entities to be connected.

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 ____.

18. A talbe is in 4NF if it is 3NF and has no ________.

19. Dependencies can be identified with the help of a dependency _____.

20. Data redundancies occur from ____ of data on every row entry.

21. In a ___ diagram - the arrows above the attribute indicate all desirable dependencies.

22. A ____ relationship exists when three entities are associated.

23. Dependencies based on only a part of a composite primary key are called ___ dependencies.

24. A ___ entity has a primary key that is partially or totally derived from the parent entity in the relationship.

25. 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.

26. The word "entity" in the ER model corresponds to a _______.

27. 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.

28. ____ yields better performance.

29. 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.

30. A table is in BCNF if every determinant in the table is a ____________.

31. A table that is in 2NF and contains no transitive dependencies is said to be in ___.

32. When a nonkey attribute is the determinate of a key attribute the table is in 3NF but not ____.

33. A ___ relationship exists when an association is maintained within a single entity.

34. A ___ relationship exists when two entities are associated.

35. BCNF can be violated only if the table contains more than one ___ key.

36. Any attribute whose value determines other values within a row is called ____.

37. A ___________ must not contain a repeating group .

38. In order to meet performance requirements - you may have to denormalize portions of the ________.

39. In the ERD - Cardinality is indicated using the ___ notation.

40. Data redundancy produces ____.

41. The price paid for increased performance through denormalization is a larger amount of ____.

42. In order to meet ___ requirements - you may have to denormalize some portion of the database.

43. 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.

44. 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 ____.

45. The ___ refers to a specific table row as an entity instance.

46. The set of possible values for an attribute is a ____.

47. 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.

48. ________ cannot be further subdivided.

49. 1NF - 2NF - and 3NF are _____.

50. Normalization represents a micro view of the ___ within the ERD.