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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 ___________ must not contain a repeating group .






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






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






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






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






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






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






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






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






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






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






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






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






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






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






16. 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.






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






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






19. Another word for existence-independent is ____.






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






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






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






23. ____ yields better performance.






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






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






26. Improving ___ leads to more flexible queries.






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






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






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






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






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






32. 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 ____.






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






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






35. 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.






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






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






38. An ERM is not dependent on the ____________.






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






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






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






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






43. 1NF - 2NF - and 3NF are _____.






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






45. 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 ____.






46. 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.






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






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






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






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






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