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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 ___ attribute is one that cannot be subdivided.






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






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






4. Data redundancy produces ____.






5. Another word for existence-independent is ____.






6. 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.






7. ________ cannot be further subdivided.






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






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






10. 1NF - 2NF - and 3NF are _____.






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






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






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






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






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






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






17. 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.






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






19. 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.






20. An ERM is not dependent on the ____________.






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






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






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






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






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






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






27. 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 ____.






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






29. A ___________ must not contain a repeating group .






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






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






32. ____ yields better performance.






33. 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 ____.






34. 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.






35. 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.






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






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






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






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






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






41. Improving ___ leads to more flexible queries.






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






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






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






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






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






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






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






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






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







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