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






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






3. ____ yields better performance.






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






5. A ______ attribute can have only one value.






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






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






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






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






10. 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.






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






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






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






14. An ERM is not dependent on the ____________.






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






16. 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 ____.






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






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






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






20. A ___________ must not contain a repeating group .






21. 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 ____.






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






23. Another word for existence-independent is ____.






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






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






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






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






28. ________ cannot be further subdivided.






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






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






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






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






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






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






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






36. BCNF can be violated only if the table contains more than one ___ key.






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






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






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






40. 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.






41. Data redundancy produces ____.






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






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






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






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






46. 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.






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






48. 1NF - 2NF - and 3NF are _____.






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






50. 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.