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






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






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






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






5. A ______ attribute can have only one value.






6. 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 ____.






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






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






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






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






11. 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 ____.






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






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






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






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






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






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






18. Improving ___ leads to more flexible queries.






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






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






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






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






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






24. Another word for existence-independent is ____.






25. A ___________ must not contain a repeating group .






26. ________ cannot be further subdivided.






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






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






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






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






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






32. Data redundancy produces ____.






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






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






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






36. 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.






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






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






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






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






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






42. 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.






43. 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.






44. 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.






45. An ERM is not dependent on the ____________.






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






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






48. 1NF - 2NF - and 3NF are _____.






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






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







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