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






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






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






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






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






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






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






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






9. 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.






10. 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.






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






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






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






14. 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.






15. Improving ___ leads to more flexible queries.






16. ____ yields better performance.






17. A ___________ must not contain a repeating group .






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






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






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






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






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






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






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






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






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






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






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






29. Data redundancy produces ____.






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. ________ cannot be further subdivided.






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






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






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






35. 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 ____.






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






37. Another word for existence-independent is ____.






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






39. 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 ____.






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






41. An ERM is not dependent on the ____________.






42. 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.






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






44. A ______ attribute can have only one value.






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






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






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






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






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






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