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






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






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






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






5. 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.






6. ____ yields better performance.






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






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






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






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






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






12. 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.






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






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






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






17. Data redundancy produces ____.






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






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






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






21. 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.






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






23. 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.






24. 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 ____.






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






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






27. ________ cannot be further subdivided.






28. 1NF - 2NF - and 3NF are _____.






29. 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 ____.






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






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






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






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






34. 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.






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






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






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






38. A ___________ must not contain a repeating group .






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






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






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






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






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






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






45. Another word for existence-independent is ____.






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






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






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






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






50. 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.







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