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






2. A ___________ must not contain a repeating group .






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






4. A ______ attribute can have only one value.






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






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






7. 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.






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






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






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






11. 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.






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






13. 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.






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






15. 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.






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






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






18. 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.






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






20. 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 ____.






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






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






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






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






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






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






27. Another word for existence-independent is ____.






28. Data redundancy produces ____.






29. ________ cannot be further subdivided.






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






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






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






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






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






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






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






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






38. 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.






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






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






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






42. ____ yields better performance.






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






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






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






46. An ERM is not dependent on the ____________.






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






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






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






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







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