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

2. 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 ____.

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

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

5. Improving ___ leads to more flexible queries.

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

7. 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.

8. 1NF - 2NF - and 3NF are _____.

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


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

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

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

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

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

16. Data redundancy produces ____.

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

18. 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.

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

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

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

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

23. An ERM is not dependent on the ____________.

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

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

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

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

28. 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.

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

30. Another word for existence-independent is ____.

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

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

33. 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.

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

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

36. 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.

37. _______ databases reflect the ever-growing demand for greater scope and depth in the data on which decision support systems increasingly rely.

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

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

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

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

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

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

44. A ___________ must not contain a repeating group .

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

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

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

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

49. 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 ____.

50. 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.