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






2. 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.






3. A ___________ must not contain a repeating group .






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






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






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






7. ____ yields better performance.






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






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






10. Another word for existence-independent is ____.






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






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






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






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






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






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






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






18. 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.






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






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






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






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






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






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






25. 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.






26. Data redundancy produces ____.






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






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






29. An ERM is not dependent on the ____________.






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






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






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






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






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






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






36. A ______ attribute can have only one value.






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






38. ________ cannot be further subdivided.






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






40. BCNF can be violated only if the table contains more than one ___ key.






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






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






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






44. 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.






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






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






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






48. 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.






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