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. The associative entity is also known as a ___ entity.

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

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

4. A ___________ must not contain a repeating group .

5. View the data as part of a table or collection of tables in which all key values must be identified.

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

7. If you have three different transitive dependencies - ___ different determinants exist.

8. A ___ identifier is composed of more than one attribute.

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

10. 1NF - 2NF - and 3NF are _____.

11. Data redundancy produces ____.

12. From a structural point of view - ______ is better than 1NF


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

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

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

17. A ___ attribute is one that cannot be subdivided.

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

21. 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.

22. A ______ attribute can have only one value.

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

24. A table where every determinant is a candidate key is said to be in ____.

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 ____.

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

27. Improving ___ leads to more flexible queries.

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

29. 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.

30. 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 ____.

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

32. 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.

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

34. ____ yields better performance.

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

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

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

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

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

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

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

42. Refers to the level of detail represented by the values stored in a table's row

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

44. Most designers consider the BCNF as a special case of the ____.

45. If an employee within an EMPLOYEE entity has a relationship with itself - that relationship is known as a ____ relationship.

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

47. An ERM is not dependent on the ____________.

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

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

50. Need not be stored physically in the data base.