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

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

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

4. A ___________ must not contain a repeating group .

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

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

8. 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 ____.

9. In order to meet performance requirements - you may have to denormalize portions of 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. 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.

13. Improving ___ leads to more flexible queries.

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

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

16. 1NF - 2NF - and 3NF are _____.

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

18. A ______ attribute can have only one value.

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

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

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

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

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

24. 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.

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

26. 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.

27. ____ yields better performance.

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

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

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

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

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

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

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

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

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

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

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

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

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

41. 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 ____.

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

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

44. 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.

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

46. 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.

47. 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.

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

49. Data redundancy produces ____.

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