Test your basic knowledge |

Data Modeling

Subject : it-skills
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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. 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.






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






3. Another word for existence-independent is ____.






4. An ERM is not dependent on the ____________.






5. 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.






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






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






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






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






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






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






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






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






14. 1NF - 2NF - and 3NF are _____.






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






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






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. A ____ relationship exists when three entities are associated.






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






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






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






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






23. Data redundancy produces ____.






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






25. ________ cannot be further subdivided.






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






27. 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.






28. ____ yields better performance.






29. Improving ___ leads to more flexible queries.






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






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






32. A ___________ must not contain a repeating group .






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






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






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






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






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






38. A ______ attribute can have only one value.






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






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






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






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






43. THE MOST LIKELY DATA TYPE FOR A SURROGATE KEY IS ____.






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






45. 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.






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






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






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






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






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