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. 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.






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






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






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






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






6. ________ cannot be further subdivided.






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






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






9. An ERM is not dependent on the ____________.






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






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






12. 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.






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






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






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






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






17. 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.






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






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






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






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






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






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






24. 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.






25. 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 ____.






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. ____ yields better performance.






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






29. Data redundancy produces ____.






30. A ______ attribute can have only one value.






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






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






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






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






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






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






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






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






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






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






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






42. 1NF - 2NF - and 3NF are _____.






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






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






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






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






47. 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.






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






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






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