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






2. 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.






3. Data redundancy produces ____.






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






5. Improving ___ leads to more flexible queries.






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






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






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






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






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






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






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






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






14. 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.






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






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






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






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






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






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






21. ________ cannot be further subdivided.






22. A ___________ must not contain a repeating group .






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






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






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






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






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






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






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






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






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






32. An ERM is not dependent on the ____________.






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






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






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






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






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






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






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






40. 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.






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






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






43. A ______ attribute can have only one value.






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






45. 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.






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






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






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






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