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






2. Data redundancy produces ____.






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






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






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






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






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






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






9. 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.






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






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






12. 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.






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






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






15. Another word for existence-independent is ____.






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






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






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






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






20. Improving ___ leads to more flexible queries.






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






22. 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.






23. 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.






24. A ______ attribute can have only one value.






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






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






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






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






29. 1NF - 2NF - and 3NF are _____.






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






31. 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.






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






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






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






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






36. 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.






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






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






39. 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 ____.






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






41. ________ cannot be further subdivided.






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






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






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






45. A ___________ must not contain a repeating group .






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






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






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






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






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







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