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

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

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

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

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

6. 1NF - 2NF - and 3NF are _____.

7. 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.

8. A ______ attribute can have only one value.

9. 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.

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

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

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

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


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

16. 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.

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

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

19. 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.

20. ____ yields better performance.

21. An ERM is not dependent on the ____________.

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

23. 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 ____.

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

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

26. 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.

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

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

29. Data redundancy produces ____.

30. Improving ___ leads to more flexible queries.

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

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

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

34. 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.

35. A ___________ must not contain a repeating group .

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

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

38. 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.

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

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

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

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

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

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

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

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

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

48. ________ cannot be further subdivided.

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

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