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






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






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






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






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






6. Another word for existence-independent is ____.






7. 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.






8. 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.






9. A ______ attribute can have only one value.






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






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






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






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






14. Data redundancy produces ____.






15. An ERM is not dependent on the ____________.






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






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






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






19. 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 ____.






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






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






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






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






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






25. ____ yields better performance.






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






27. 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.






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






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






30. A ___________ must not contain a repeating group .






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






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






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






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






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






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






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






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






39. 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.






40. 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.






41. Improving ___ leads to more flexible queries.






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






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






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






45. 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 ____.






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






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






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






49. ________ cannot be further subdivided.






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






Can you answer 50 questions in 15 minutes?



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