Test your basic knowledge |

Data Modeling

Subject : it-skills
Instructions:
  • Answer 50 questions in 30 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. If an employee within an EMPLOYEE entity has a relationship with itself - that relationship is known as a ____ relationship.






2. A ______ attribute can have only one value.






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






4. An ERM is not dependent on the ____________.






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






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






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






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






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






10. According to naming conventions described in Chapter 2 - ___ would be the best name for a column representing the charges per hour in a table named JOB.






11. Data redundancy produces ____.






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






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






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






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






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






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






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






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






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






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






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






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






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






25. Improving ___ leads to more flexible queries.






26. 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 ____.






27. 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.






28. ____ yields better performance.






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






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






31. 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.






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






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






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






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






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






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






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






39. 1NF - 2NF - and 3NF are _____.






40. 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.






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






42. ________ cannot be further subdivided.






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






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






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






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






47. 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.






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






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






50. Another word for existence-independent is ____.






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