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






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






3. A ______ attribute can have only one value.






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






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






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






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






8. 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 ____.






9. A ___________ must not contain a repeating group .






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






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






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






13. An ERM is not dependent on the ____________.






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






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






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






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






18. 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.






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






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






21. 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 ____.






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






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






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






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






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






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






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






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






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






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






32. Data redundancy produces ____.






33. 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.






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






35. Improving ___ leads to more flexible queries.






36. Another word for existence-independent is ____.






37. ____ yields better performance.






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






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






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






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






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






43. 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.






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






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






46. ________ cannot be further subdivided.






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






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






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






50. From a system functionality point of view - ___ attribute values can be calculated when they are needed to write reports or invoices.