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. A ______ attribute can have only one value.






2. Improving ___ leads to more flexible queries.






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






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






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






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






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






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






9. Another word for existence-independent is ____.






10. 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.






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






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






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






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






15. An ERM is not dependent on the ____________.






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






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






18. 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.






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






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






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






22. ________ cannot be further subdivided.






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






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






25. 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 ____.






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






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






28. 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.






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






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






31. Data redundancy produces ____.






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






33. ____ yields better performance.






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






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






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






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






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






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






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






41. 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.






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






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






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






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






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






47. A ___________ must not contain a repeating group .






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






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






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







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