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






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






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






4. Improving ___ leads to more flexible queries.






5. 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.






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






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






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






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






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






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






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






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






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






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






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






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






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






19. ________ cannot be further subdivided.






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






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






22. 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.






23. A ______ attribute can have only one value.






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






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






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






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






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






29. Another word for existence-independent is ____.






30. 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.