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

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

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

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

5. 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.

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

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

8. Another word for existence-independent is ____.

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

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

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

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

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

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

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

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

18. Data redundancy produces ____.

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

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

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

22. 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.

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

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

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

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

27. A ______ attribute can have only one value.

28. 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 ____.

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

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

31. A ___________ must not contain a repeating group .

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

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

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

35. 1NF - 2NF - and 3NF are _____.

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

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

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

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

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

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

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

43. 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 ____.

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

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

46. ____ yields better performance.

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

48. 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.

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

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