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 MOST LIKELY DATA TYPE FOR A SURROGATE KEY IS ____.






2. Improving ___ leads to more flexible queries.






3. A ______ attribute can have only one value.






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






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






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






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






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






9. 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.






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






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






12. Another word for existence-independent is ____.






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






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






15. 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.






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






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






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






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






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






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






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






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






24. An ERM is not dependent on the ____________.






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






26. ____ yields better performance.






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






28. 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.






29. 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.






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






31. A ___________ must not contain a repeating group .






32. 1NF - 2NF - and 3NF are _____.






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






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






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






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






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






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






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






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






41. 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.






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






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






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






45. Data redundancy produces ____.






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






47. 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.






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






49. 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.






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