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






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






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






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






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






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






7. 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.






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






9. An ERM is not dependent on the ____________.






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






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






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






13. 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.






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






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






16. A ______ attribute can have only one value.






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






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






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






20. Another word for existence-independent is ____.






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






22. Data redundancy produces ____.






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






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






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






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






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






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






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






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






31. 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 ____.






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






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






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






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






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






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






38. 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 ____.






39. 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.






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






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






42. 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.






43. A ___________ must not contain a repeating group .






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






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






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






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






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






50. Improving ___ leads to more flexible queries.