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

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

4. 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.

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

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

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

8. 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 ____.

9. ________ cannot be further subdivided.

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


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

13. An ERM is not dependent on the ____________.

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

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

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

17. A ___________ must not contain a repeating group .

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

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

20. ____ yields better performance.

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

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

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

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

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

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

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

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

29. Improving ___ leads to more flexible queries.

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

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

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

33. 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.

34. 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.

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

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

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

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

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

40. 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.

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

42. 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.

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

44. A ______ attribute can have only one value.

45. 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.

46. Another word for existence-independent is ____.

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

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

49. 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.

50. 1NF - 2NF - and 3NF are _____.