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






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






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






4. Improving ___ leads to more flexible queries.






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






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






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






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






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






10. 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.






11. 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.






12. 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.






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






14. 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 ____.






15. Another word for existence-independent is ____.






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






17. A ___________ must not contain a repeating group .






18. ________ cannot be further subdivided.






19. A ______ attribute can have only one value.






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






21. 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 ____.






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






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






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






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






26. Data redundancy produces ____.






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






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






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






30. 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.






31. 1NF - 2NF - and 3NF are _____.






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






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






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






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






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






37. 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.






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






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






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






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






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






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






44. ____ yields better performance.






45. 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.






46. 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.






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






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






49. An ERM is not dependent on the ____________.






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