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






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






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






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






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






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






7. 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.






8. 1NF - 2NF - and 3NF are _____.






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






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






11. Data redundancy produces ____.






12. Another word for existence-independent is ____.






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






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






15. 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.






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






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






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






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






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






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






22. A ___________ must not contain a repeating group .






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






24. 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 ____.






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






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






27. An ERM is not dependent on the ____________.






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






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






30. 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.






31. 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.






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






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






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






35. Improving ___ leads to more flexible queries.






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






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






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






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






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






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






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






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






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






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






47. 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.






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






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






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