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






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






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






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






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






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






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






8. Another word for existence-independent is ____.






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






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






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






12. 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.






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






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






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






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






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






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






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






20. An ERM is not dependent on the ____________.






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






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






24. ________ cannot be further subdivided.






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






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






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






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






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






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






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






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






33. 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.






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






35. ____ yields better performance.






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






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






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






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






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






41. A ___________ must not contain a repeating group .






42. 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.






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






44. 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 ____.






45. Improving ___ leads to more flexible queries.






46. 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.






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






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






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






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






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