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. ________ cannot be further subdivided.






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






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






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






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






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






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






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






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






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






12. Another word for existence-independent is ____.






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






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






15. A ______ attribute can have only one value.






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






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






18. 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.






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






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






21. 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 ____.






22. 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 ____.






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






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






25. 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.






26. A ___________ must not contain a repeating group .






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






28. An ERM is not dependent on the ____________.






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






30. Data redundancy produces ____.






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






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






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






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






35. 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.






36. 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.






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






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






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






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






41. 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.






42. Improving ___ leads to more flexible queries.






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






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






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






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






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






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






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






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