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






2. 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.






3. 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.






4. 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.






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






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






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






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






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






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






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






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






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






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






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






16. 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.






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






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






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






20. 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 ____.






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






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






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






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






25. 1NF - 2NF - and 3NF are _____.






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






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






28. 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 ____.






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






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






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






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






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






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






35. A ______ attribute can have only one value.






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






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






38. Data redundancy produces ____.






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






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






41. Another word for existence-independent is ____.






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






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






44. An ERM is not dependent on the ____________.






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






46. 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.






47. A ___________ must not contain a repeating group .






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






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






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