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

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


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

5. 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.

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

7. Another word for existence-independent is ____.

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

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

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

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

12. 1NF - 2NF - and 3NF are _____.

13. 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.

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

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

16. 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.

17. Improving ___ leads to more flexible queries.

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

19. 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 ____.

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

21. 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.

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

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

24. A ___________ must not contain a repeating group .

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

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

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

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

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

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

31. An ERM is not dependent on the ____________.

32. 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.

33. ____ yields better performance.

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

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

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

37. 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.

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

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

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

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

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

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

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

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

46. 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.

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

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

49. 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 ____.

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