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






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






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






4. 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.






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






6. Data redundancy produces ____.






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






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






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






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






11. Improving ___ leads to more flexible queries.






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






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






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






15. 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.






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






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






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






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






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






21. A ___________ must not contain a repeating group .






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






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






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






25. A ______ attribute can have only one value.






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






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






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






29. ________ cannot be further subdivided.






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






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






32. An ERM is not dependent on the ____________.






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






34. 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.






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






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






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






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






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






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






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






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






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






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






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






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






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






48. 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.






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






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