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






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






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






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






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






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






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






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






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






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






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






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






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






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






15. 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.






16. Improving ___ leads to more flexible queries.






17. 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.






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






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






20. ____ yields better performance.






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






37. 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.






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






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






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






41. ________ cannot be further subdivided.






42. 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.






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






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






45. A ______ attribute can have only one value.






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






47. 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.






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






49. Another word for existence-independent is ____.






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