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.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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

2. 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.

3. Data redundancy produces ____.

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

6. A ___________ must not contain a repeating group .

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

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

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

11. 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.

12. Improving ___ leads to more flexible queries.


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

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

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

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

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

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

20. 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.

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

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

23. 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.

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

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

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

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

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

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

30. 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.

31. 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.

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

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

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

35. ________ cannot be further subdivided.

36. An ERM is not dependent on the ____________.

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

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

39. ____ yields better performance.

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

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

42. 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 ____.

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

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

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

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

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

48. 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.

49. A ______ attribute can have only one value.

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