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






2. ____ yields better performance.






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






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






5. 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 ____.






6. 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 ____.






7. 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.






8. A ______ attribute can have only one value.






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






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






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






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






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






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






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






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






17. 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.






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






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






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






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






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






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






24. 1NF - 2NF - and 3NF are _____.






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






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






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






28. ________ cannot be further subdivided.






29. Another word for existence-independent is ____.






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






31. 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.






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






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






34. An ERM is not dependent on the ____________.






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






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






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






38. 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.






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






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






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






42. Data redundancy produces ____.






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






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






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






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






47. 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.






48. 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.






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






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