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. Need not be stored physically in the data base.






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






3. ____ yields better performance.






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






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






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






7. A ______ attribute can have only one value.






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






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






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






11. 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.






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






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






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






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






16. Improving ___ leads to more flexible queries.






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






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






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






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






21. 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.






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






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






24. ________ cannot be further subdivided.






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






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






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






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






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






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






31. 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.






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






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






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






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






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






37. 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.






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






39. 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.






40. 1NF - 2NF - and 3NF are _____.






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






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






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






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






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






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






47. 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 ____.






48. A ___________ must not contain a repeating group .






49. 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.






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