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 associative entity is also known as a ___ entity.






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






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






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






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






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






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






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






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






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






11. 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.






12. 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.






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






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






15. Data redundancy produces ____.






16. An ERM is not dependent on the ____________.






17. 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.






18. A ______ attribute can have only one value.






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






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






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






22. 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 ____.






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






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






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






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






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






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






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






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






31. 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.






32. 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.






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






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






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






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






37. A ___________ must not contain a repeating group .






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






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






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






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






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






43. Another word for existence-independent is ____.






44. 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 ____.






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






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






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






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






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






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