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. 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.






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






3. ________ cannot be further subdivided.






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






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






6. 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 ____.






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






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






9. A ___________ must not contain a repeating group .






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






11. 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 ____.






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






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






14. An ERM is not dependent on the ____________.






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






16. 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.






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






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






20. 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.






21. Data redundancy produces ____.






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






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






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






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






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






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






28. 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.






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






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






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






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






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






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






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






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






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






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






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






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






41. ____ yields better performance.






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






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






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






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






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






47. 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.






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






49. Another word for existence-independent is ____.






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