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






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






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






4. 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.






5. 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.






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






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






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






9. 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.






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






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






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






13. Another word for existence-independent is ____.






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






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






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






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






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






19. 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.






20. A ______ attribute can have only one value.






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






22. 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.






23. 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 ____.






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






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






26. ____ yields better performance.






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






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






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






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






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






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






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






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






36. An ERM is not dependent on the ____________.






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






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






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






40. Data redundancy produces ____.






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






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






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






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






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






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






47. 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.






48. 1NF - 2NF - and 3NF are _____.






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






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