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






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






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






4. 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.






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






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






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






8. A ______ attribute can have only one value.






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






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






11. Improving ___ leads to more flexible queries.






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






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






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






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






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






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






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






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






20. 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.






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






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






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






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






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






26. ____ yields better performance.






27. 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 ____.






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






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






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






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






32. 1NF - 2NF - and 3NF are _____.






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






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






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






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






37. 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.






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






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






40. 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.






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






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






43. Another word for existence-independent is ____.






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






45. A ___________ must not contain a repeating group .






46. 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.






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






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






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






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