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

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

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

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

5. 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.


7. A ______ attribute can have only one value.

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

9. Improving ___ leads to more flexible queries.

10. ____ yields better performance.

11. 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 ____.

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

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

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

15. 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.

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

17. Data redundancy produces ____.

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

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

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

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

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

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

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

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

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

27. 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 ____.

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

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

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

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

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

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

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

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

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

37. An ERM is not dependent on the ____________.

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

39. 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.

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

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

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

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

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

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

46. 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.

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

48. 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.

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

50. A ___________ must not contain a repeating group .