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






2. 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.






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






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






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






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






7. 1NF - 2NF - and 3NF are _____.






8. ________ cannot be further subdivided.






9. 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.






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






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






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






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






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






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






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






17. An ERM is not dependent on the ____________.






18. 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.






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






20. 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 ____.






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






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






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






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






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






26. 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 ____.






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






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






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






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






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






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






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






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






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






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






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






38. A ___________ must not contain a repeating group .






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






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






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






42. Improving ___ leads to more flexible queries.






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






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






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






46. Data redundancy produces ____.






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






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






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






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