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






2. Data redundancy produces ____.






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






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






5. 1NF - 2NF - and 3NF are _____.






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






7. An ERM is not dependent on the ____________.






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






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






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






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






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






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






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






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






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






17. Improving ___ leads to more flexible queries.






18. A ______ attribute can have only one value.






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






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






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






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






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






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






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






26. A ___________ must not contain a repeating group .






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






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






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






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






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






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






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






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






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






36. 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.






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






38. 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.






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






40. Another word for existence-independent is ____.






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






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






43. 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 ____.






44. 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.






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






46. ________ cannot be further subdivided.






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






48. 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.






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






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







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