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






2. Another word for existence-independent is ____.






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






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






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






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






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






8. A ___________ must not contain a repeating group .






9. 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.






10. 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.






11. 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.






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






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






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






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






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






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






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






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






20. 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.






21. 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.






22. 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.






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






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






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






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






27. A ______ attribute can have only one value.






28. An ERM is not dependent on the ____________.






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






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






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






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






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






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






35. Data redundancy produces ____.






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






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






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






39. ____ yields better performance.






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






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






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






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






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






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






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






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






48. 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 ____.






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






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