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






2. 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.






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






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






5. Another word for existence-independent is ____.






6. A ____ exists when there are functional dependencies such that Y is functionally dependent on X and Z is functionally dependent on Y - and X is the primary key.






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






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






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






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






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






12. 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 ____.






13. Data redundancy produces ____.






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






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






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






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






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






19. 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.






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






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






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






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






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






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






26. An ERM is not dependent on the ____________.






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






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






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






30. 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.






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






32. 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.






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






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






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






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






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






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






39. 1NF - 2NF - and 3NF are _____.






40. 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.






41. ________ cannot be further subdivided.






42. 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.






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






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






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






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






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






49. A ___________ must not contain a repeating group .






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