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. A ___ attribute is one that cannot be subdivided.






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






3. 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.






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






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






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






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






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






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






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






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






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






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






14. 1NF - 2NF - and 3NF are _____.






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






16. 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.






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






18. 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.






19. A ___________ must not contain a repeating group .






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






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






22. A ______ attribute can have only one value.






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






24. Data redundancy produces ____.






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






26. 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.






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






28. 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 ____.






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






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






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






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






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






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






35. ____ yields better performance.






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






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






38. Another word for existence-independent is ____.






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






40. ________ cannot be further subdivided.






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






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






43. 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.






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






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






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






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






48. 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.






49. Improving ___ leads to more flexible queries.






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