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. 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.






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






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






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






5. A ______ attribute can have only one value.






6. Another word for existence-independent is ____.






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






8. An ERM is not dependent on the ____________.






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






10. 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 ____.






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






12. 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 ____.






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






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






15. Improving ___ leads to more flexible queries.






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






17. 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.






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






19. A ___________ must not contain a repeating group .






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






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






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






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






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






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






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






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






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






29. 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.






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






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






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






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






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






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






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






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






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






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






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






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






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






43. If a table has multiple candidate keys and one of those candidate keys is a composite key - the table can have ___ based on this composite candidate key - even when the primary key chosen is a single attribute.






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






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






46. 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.






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






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






49. ________ cannot be further subdivided.






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