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






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






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






4. ________ cannot be further subdivided.






5. 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.






6. 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.






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






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






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






10. Improving ___ leads to more flexible queries.






11. 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.






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






13. 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.






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






15. A ______ attribute can have only one value.






16. 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.






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






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






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






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






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






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






23. Another word for existence-independent is ____.






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






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






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






27. 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.






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






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






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






31. Data redundancy produces ____.






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






33. 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.






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






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






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






37. 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 ____.






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






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






40. An ERM is not dependent on the ____________.






41. 1NF - 2NF - and 3NF are _____.






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






43. A ___________ must not contain a repeating group .






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






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






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






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






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






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






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