Test your basic knowledge |

Data Modeling

Subject : it-skills
Instructions:
  • Answer 30 questions in 15 minutes. 1 minute extra for reading the instructions.
  • 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. 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.






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






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






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






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






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






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






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






10. A ______ attribute can have only one value.






11. ________ cannot be further subdivided.






12. An ERM is not dependent on the ____________.






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






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






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






17. 1NF - 2NF - and 3NF are _____.






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






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






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






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






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






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






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






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






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






27. 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 ____.






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






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






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