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






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






3. ____ yields better performance.






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






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






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






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






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






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






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






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






12. 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.






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






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






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






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






17. 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 ____.






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






19. 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.






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






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






22. Another word for existence-independent is ____.






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






24. ________ cannot be further subdivided.






25. A ___________ must not contain a repeating group .






26. 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.






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






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






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






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






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






32. An ERM is not dependent on the ____________.






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






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






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






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






37. Data redundancy produces ____.






38. 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.






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






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






41. A ______ attribute can have only one value.






42. 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.






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






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






45. 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 ____.






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






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






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






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






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