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






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






4. Another word for existence-independent is ____.






5. 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.






6. Data redundancy produces ____.






7. 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.






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






9. A ___________ must not contain a repeating group .






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






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






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






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






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






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






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






17. A ______ attribute can have only one value.






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






19. 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.






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






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






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






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






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






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






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






27. ________ cannot be further subdivided.






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






29. 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.






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






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






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






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






34. 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.






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






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






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






38. ____ yields better performance.






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






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






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






42. An ERM is not dependent on the ____________.






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






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






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






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






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






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






49. Improving ___ leads to more flexible queries.






50. 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 ____.