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






2. 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.






3. 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.






4. A ___________ must not contain a repeating group .






5. 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 ____.






6. 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.






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






8. 1NF - 2NF - and 3NF are _____.






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






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






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






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






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






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






15. ____ yields better performance.






16. Another word for existence-independent is ____.






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






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






19. A ______ attribute can have only one value.






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






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






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






23. 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.






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






25. Improving ___ leads to more flexible queries.






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






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






28. 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 ____.






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






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






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






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






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






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






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






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






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






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






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






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






41. An ERM is not dependent on the ____________.






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






43. 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.






44. Data redundancy produces ____.






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






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






47. ________ cannot be further subdivided.






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






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






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