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. The word "entity" in the ER model corresponds to 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. In order to meet ___ requirements - you may have to denormalize some portion of the database.






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






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






6. 1NF - 2NF - and 3NF are _____.






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






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






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






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






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






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






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






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






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






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






17. 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.






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






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






20. ________ cannot be further subdivided.






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






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






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






24. 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.






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






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






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






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






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






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






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






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






33. Another word for existence-independent is ____.






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






35. 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 ____.






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






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






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






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






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






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






42. Improving ___ leads to more flexible queries.






43. 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.






44. A ______ attribute can have only one value.






45. ____ yields better performance.






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






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






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






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






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