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Data Modeling

Subject : it-skills
Instructions:
  • Answer 50 questions in 30 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. Most designers consider the BCNF as a special case of the ____.






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






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






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






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






6. 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.






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






8. An ERM is not dependent on the ____________.






9. 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 ____.






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






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






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






13. Data redundancy produces ____.






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






15. 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.






16. Another word for existence-independent is ____.






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






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






19. 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.






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






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






22. 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.






23. A ______ attribute can have only one value.






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






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






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






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






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






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






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






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






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






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






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






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






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






38. 1NF - 2NF - and 3NF are _____.






39. A ___________ must not contain a repeating group .






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






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






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






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






44. ____ yields better performance.






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






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






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






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






49. ________ cannot be further subdivided.






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






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