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 MOST LIKELY DATA TYPE FOR A SURROGATE KEY IS ____.






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






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






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






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






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






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






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






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






10. 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.






11. 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.






12. 1NF - 2NF - and 3NF are _____.






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






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






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






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






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






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






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






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






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






22. A ___________ must not contain a repeating group .






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






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






25. 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.






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






27. Data redundancy produces ____.






28. ____ yields better performance.






29. 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.






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






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






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






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






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






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






36. 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.






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






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






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






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






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






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






44. ________ cannot be further subdivided.






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






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






47. An ERM is not dependent on the ____________.






48. 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 ____.






49. Another word for existence-independent is ____.






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