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 set of possible values for an attribute is a ____.






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






3. A ______ attribute can have only one value.






4. 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.






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






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






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






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






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






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






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






12. 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.






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






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






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






16. An ERM is not dependent on the ____________.






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






18. 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.






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






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






21. 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.






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






23. 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.






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






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






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






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






28. 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.






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






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






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






32. Improving ___ leads to more flexible queries.






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






34. ____ yields better performance.






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






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






37. Another word for existence-independent is ____.






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






39. 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 ____.






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






41. Data redundancy produces ____.






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






43. 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.






44. A ___________ must not contain a repeating group .






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






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






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






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






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






50. 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 ____.