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






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






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






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






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






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






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






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






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






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






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






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






13. 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.






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






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






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






17. A ___________ must not contain a repeating group .






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






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






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






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






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






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






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






25. 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 ____.






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






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






28. Another word for existence-independent is ____.






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






30. ____ yields better performance.






31. 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.






32. An ERM is not dependent on the ____________.






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






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






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






36. 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.






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






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






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






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






41. 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.






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






43. 1NF - 2NF - and 3NF are _____.






44. 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.






45. 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.






46. ________ cannot be further subdivided.






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






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






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






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