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 ____ relationship exists when three entities are associated.






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






3. 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.






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






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






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






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






8. An ERM is not dependent on the ____________.






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






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






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






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






13. 1NF - 2NF - and 3NF are _____.






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






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






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






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






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






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






20. 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.






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






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






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






24. A ______ attribute can have only one value.






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






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






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






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






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






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






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






32. 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.






33. 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.






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






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






36. 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 ____.






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






38. ____ yields better performance.






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






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






41. Data redundancy produces ____.






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






43. ________ cannot be further subdivided.






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






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






46. 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.






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






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






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