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






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






4. ________ cannot be further subdivided.






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






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






7. Data redundancy produces ____.






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






9. 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.






10. 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.






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






12. Another word for existence-independent is ____.






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






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






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






16. 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 ____.






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






18. 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.






19. ____ yields better performance.






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






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






22. 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.






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






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






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






26. 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.






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






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






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






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






31. 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 ____.






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






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






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






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






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






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






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






39. Improving ___ leads to more flexible queries.






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






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






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






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






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






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






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






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






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






49. An ERM is not dependent on the ____________.






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