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






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






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






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






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






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






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






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






9. A ______ attribute can have only one value.






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






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






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






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






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






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






16. Another word for existence-independent is ____.






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






18. An ERM is not dependent on the ____________.






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






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






21. 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.






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






23. 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.






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






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






26. A ___________ must not contain a repeating group .






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






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






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






30. 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.






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






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






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






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






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






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






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






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






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






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






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






43. ____ yields better performance.






44. Data redundancy produces ____.






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






46. 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 ____.






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






48. Improving ___ leads to more flexible queries.






49. ________ cannot be further subdivided.






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