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






2. ________ cannot be further subdivided.






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






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






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






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






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






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






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






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






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






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






14. An ERM is not dependent on the ____________.






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






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






17. A ______ attribute can have only one value.






18. 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.






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






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






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






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






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






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






25. 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.






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






27. A ___________ must not contain a repeating group .






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






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






30. 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 ____.






31. Data redundancy produces ____.






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






33. 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.






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






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






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






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






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






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






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






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






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






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






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






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






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






47. 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.






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






49. 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 ____.






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