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. ____ yields better performance.






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






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






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






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






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






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






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






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






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






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






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






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






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






15. 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.






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






17. 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.






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






19. 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 ____.






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






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






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






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






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






25. Another word for existence-independent is ____.






26. 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.






27. 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.






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






29. 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.






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






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






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






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






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






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






36. A ___________ must not contain a repeating group .






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






38. ________ cannot be further subdivided.






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






40. A ______ attribute can have only one value.






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






42. 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 ____.






43. 1NF - 2NF - and 3NF are _____.






44. 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.






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






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






47. Improving ___ leads to more flexible queries.






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






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






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