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






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






3. 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 ____.






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






5. 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.






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






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






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






9. 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.






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






11. 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.






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






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






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






15. 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.






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






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






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






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






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






21. 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.






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






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






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






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






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






27. ________ cannot be further subdivided.






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






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






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






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






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






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






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






35. An ERM is not dependent on the ____________.






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






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






38. ____ yields better performance.






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






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






42. Data redundancy produces ____.






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






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






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






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






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






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






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






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