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

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

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

4. A ___________ must not contain a repeating group .

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

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

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

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

9. An ERM is not dependent on the ____________.

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

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

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

13. 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 ____.


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

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

17. 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.

18. 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.

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

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

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

22. Improving ___ leads to more flexible queries.

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

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

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

26. 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.

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

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

29. 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.

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

31. Another word for existence-independent is ____.

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

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

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

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

36. 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.

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

38. 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 ____.

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

40. 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.

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

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

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

44. Data redundancy produces ____.

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

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

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

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

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

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