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

2. 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.

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

4. 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 ____.

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

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

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

8. 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.

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

10. 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.

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

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

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

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

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

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

17. 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.

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

19. Improving ___ leads to more flexible queries.

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

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

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

23. Data redundancy produces ____.

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

25. 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.

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

27. 1NF - 2NF - and 3NF are _____.

28. An ERM is not dependent on the ____________.

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

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

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

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

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

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

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

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

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

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

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

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

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

42. 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 ____.

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

44. ____ yields better performance.

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

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

47. A ______ attribute can have only one value.

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

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

50. ________ cannot be further subdivided.