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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. 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.






2. A ___________ must not contain a repeating group .






3. A ______ attribute can have only one value.






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






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






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






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






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






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






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






11. Another word for existence-independent is ____.






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






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






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






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






16. 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.






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






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






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






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






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






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






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






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






25. ____ yields better performance.






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






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






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






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






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






31. Improving ___ leads to more flexible queries.






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






33. ________ cannot be further subdivided.






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






35. 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.






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






38. 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.






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






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






41. Data redundancy produces ____.






42. 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.






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






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






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






46. 1NF - 2NF - and 3NF are _____.






47. 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.






48. An ERM is not dependent on the ____________.






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






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







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