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






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






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






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






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






6. 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.






7. Improving ___ leads to more flexible queries.






8. 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.






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






10. A ______ attribute can have only one value.






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






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






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






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






15. 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 ____.






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






17. ________ cannot be further subdivided.






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






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






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






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






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






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






24. 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.






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






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






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






28. ____ yields better performance.






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






30. A ___________ must not contain a repeating group .






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






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






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






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






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






36. 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.






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






38. Data redundancy produces ____.






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






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






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






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






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






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






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






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






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






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






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