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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 ____ 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.






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






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






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






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






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






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






8. 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.






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






10. 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.






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






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






13. 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.






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






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






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






17. ____ yields better performance.






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






19. 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 ____.






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






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






22. Data redundancy produces ____.






23. An ERM is not dependent on the ____________.






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






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






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






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






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






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






31. 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 ____.






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






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






34. A ___________ must not contain a repeating group .






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






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






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






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






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






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






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






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. Improving ___ leads to more flexible queries.






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






45. A ______ attribute can have only one value.






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






47. ________ cannot be further subdivided.






48. 1NF - 2NF - and 3NF are _____.






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






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







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