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






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






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






4. 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.






5. ____ yields better performance.






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






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






8. A ___________ must not contain a repeating group .






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






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






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






12. 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 ____.






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






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






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






16. 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.






17. 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.






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






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






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






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






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






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






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






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






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






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






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






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






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






31. 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 ____.






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






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






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






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






36. Another word for existence-independent is ____.






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






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






39. Data redundancy produces ____.






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






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






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






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






44. Improving ___ leads to more flexible queries.






45. 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.






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






47. 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.






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






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






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







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