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. Improving ___ leads to more flexible queries.

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

3. 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.

4. 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.

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

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

7. An ERM is not dependent on the ____________.

8. 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 ____.

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


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

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

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

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

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

16. 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.

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

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

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

20. 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.

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

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

23. 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.

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

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

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

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

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

29. A ______ attribute can have only one value.

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

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

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

33. ________ cannot be further subdivided.

34. A ___________ must not contain a repeating group .

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

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

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

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

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

40. 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.

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

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

43. 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 ____.

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

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

46. Data redundancy produces ____.

47. 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.

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

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

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