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 ___ attribute is one that cannot be subdivided.






2. 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.






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






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






5. Data redundancy produces ____.






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






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






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






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






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






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






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






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






14. A ______ attribute can have only one value.






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






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






17. 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.






18. 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.






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






20. 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.






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






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






23. ________ cannot be further subdivided.






24. ____ yields better performance.






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






26. 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.






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






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






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






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






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






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






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






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






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






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






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






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






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






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






41. 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 ____.






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






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






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






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






46. Improving ___ leads to more flexible queries.






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






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






49. 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.






50. 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.






Search BasicVersity Tests



OR

Browse BasicVersity