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. 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.

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

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

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

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

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

7. Another word for existence-independent is ____.

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

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

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

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

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

13. 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.

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

15. Improving ___ leads to more flexible queries.

16. 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.

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

18. A ______ attribute can have only one value.

19. ________ cannot be further subdivided.

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

21. 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.

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

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

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

25. 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.

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

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

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

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

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

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

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

33. 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 ____.

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

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

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


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

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

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

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

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

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

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

45. A ___________ must not contain a repeating group .

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

47. 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.

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

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

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