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






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






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






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






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






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






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






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






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






10. 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.






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






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






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






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






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






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






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






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






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






20. A ___________ must not contain a repeating group .






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






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






23. 1NF - 2NF - and 3NF are _____.






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






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






26. In order to meet performance requirements - you may have to denormalize portions of the ________.






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






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






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






30. 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.






31. 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 ____.






32. Data redundancy produces ____.






33. Another word for existence-independent is ____.






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






35. 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.






36. 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.






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






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. A ______ attribute can have only one value.






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






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






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






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






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






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






46. ________ cannot be further subdivided.






47. An ERM is not dependent on the ____________.






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






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






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