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. Data redundancy produces ____.






2. 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 ____.






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






4. ________ cannot be further subdivided.






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






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






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






8. 1NF - 2NF - and 3NF are _____.






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






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






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






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






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






14. Another word for existence-independent is ____.






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






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






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






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






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






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






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






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






23. 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.






24. A ___________ must not contain a repeating group .






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






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






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






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






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






30. A ______ attribute can have only one value.






31. 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.






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






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






34. 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 ____.






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






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






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






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






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






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






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






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






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






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






45. 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.






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






47. 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.






48. 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.






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






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