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. 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.






3. Another word for existence-independent is ____.






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






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






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






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






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






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






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






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






12. ________ cannot be further subdivided.






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






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






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






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






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






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






19. 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 ____.






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






21. A ___________ must not contain a repeating group .






22. A ______ attribute can have only one value.






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






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






25. 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.






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






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






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






29. 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.






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






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






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






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






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






35. 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.






36. Data redundancy produces ____.






37. 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.






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






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






40. An ERM is not dependent on the ____________.






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






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






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






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






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






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






47. 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.






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






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






50. For most business transactional databases - we should normalize relations into ____.