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






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






4. ________ cannot be further subdivided.






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






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






7. 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.






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






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






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






11. Improving ___ leads to more flexible queries.






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






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






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






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






16. 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.






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






18. An ERM is not dependent on the ____________.






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






20. 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 ____.






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






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






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






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






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






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






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






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






29. A ___________ must not contain a repeating group .






30. ____ yields better performance.






31. 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.






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






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






34. 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 ____.






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






36. 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.






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






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






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






40. 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.






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






42. 1NF - 2NF - and 3NF are _____.






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






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






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






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






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






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






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






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