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






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






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






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






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






6. ________ cannot be further subdivided.






7. 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.






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






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






10. ____ yields better performance.






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






12. 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.






13. An ERM is not dependent on the ____________.






14. Data redundancy produces ____.






15. 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.






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






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






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






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






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






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






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






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






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






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






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






27. Improving ___ leads to more flexible queries.






28. A ______ attribute can have only one value.






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






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






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






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






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






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






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






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






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






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






39. 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.






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






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






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






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






44. A ___________ must not contain a repeating group .






45. 1NF - 2NF - and 3NF are _____.






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






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






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






49. 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.






50. 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 ____.