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

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

3. A ___________ must not contain a repeating group .

4. An ERM is not dependent on the ____________.

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

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

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

8. 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.

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

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

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

12. 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 ____.

13. 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.

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

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

16. A ______ attribute can have only one value.

17. Data redundancy produces ____.

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

19. 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.

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

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

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

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

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

25. Another word for existence-independent is ____.

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

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

28. 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.

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

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

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


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

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

35. 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.

36. The associative entity is also known as a ___ 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. BCNF can be violated only if the table contains more than one ___ key.

39. 1NF - 2NF - and 3NF are _____.

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

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

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

43. 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.

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

45. 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 ____.

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

47. Improving ___ leads to more flexible queries.

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

49. ________ cannot be further subdivided.

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