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. A ___ attribute is one that cannot be subdivided.

2. A ______ attribute can have only one value.

3. 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.

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

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

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

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

8. 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.

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

10. An ERM is not dependent on the ____________.

11. 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.

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

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

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

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

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

17. 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.

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

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

20. ________ cannot be further subdivided.

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

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

23. 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 ____.

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

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

26. 1NF - 2NF - and 3NF are _____.

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

28. Data redundancy produces ____.

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

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

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

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

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

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


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

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

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

39. 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 ____.

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

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

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

43. ____ yields better performance.

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

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

46. Improving ___ leads to more flexible queries.

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

48. 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.

49. 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.

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