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. 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.






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






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






4. 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.






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






6. A ___________ must not contain a repeating group .






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






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






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






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






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






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






13. A ______ attribute can have only one value.






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






15. Another word for existence-independent is ____.






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






17. An ERM is not dependent on the ____________.






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






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






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






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






22. 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.






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






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






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






26. ________ cannot be further subdivided.






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






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






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






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






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






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






33. 1NF - 2NF - and 3NF are _____.






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






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






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






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






38. 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.






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






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






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






42. Improving ___ leads to more flexible queries.






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






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






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






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






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






48. 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 ____.






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






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