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






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






3. Improving ___ leads to more flexible queries.






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






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






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






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






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






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






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






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






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






13. 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.






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






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






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






17. 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.






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






19. 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.






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






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






22. An ERM is not dependent on the ____________.






23. ________ cannot be further subdivided.






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






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






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






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






28. Another word for existence-independent is ____.






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






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






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






32. A ___________ must not contain a repeating group .






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






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






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






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






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






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






39. Data redundancy produces ____.






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






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






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






43. 1NF - 2NF - and 3NF are _____.






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






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






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






47. 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 ____.






48. 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.






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






50. 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 ____.