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






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






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






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






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






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






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






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






9. ____ yields better performance.






10. 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.






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






12. ________ cannot be further subdivided.






13. 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.






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






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






16. 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.






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






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






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






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






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






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






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






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






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






26. Improving ___ leads to more flexible queries.






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






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






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






30. 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.






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






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






33. An ERM is not dependent on the ____________.






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






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






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






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






38. 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.






39. 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.






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






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






42. A ______ attribute can have only one value.






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






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






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






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






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






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






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






50. 1NF - 2NF - and 3NF are _____.