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

2. 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.

3. 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.

4. A ___________ must not contain a repeating group .

5. 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 ____.

6. 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.

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

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

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

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

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

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

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

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

15. ____ yields better performance.

16. Another word for existence-independent is ____.

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

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

19. A ______ attribute can have only one value.

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

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

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

23. 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.

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

25. Improving ___ leads to more flexible queries.

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

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

28. 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 ____.

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

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

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

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

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

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

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

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

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

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

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

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

41. An ERM is not dependent on the ____________.

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

43. 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.

44. Data redundancy produces ____.

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

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

47. ________ cannot be further subdivided.

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

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

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