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. Data redundancy produces ____.






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






3. 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.






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






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






6. Another word for existence-independent is ____.






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






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






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






10. ________ cannot be further subdivided.






11. ____ yields better performance.






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






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






14. 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.






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






38. 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.






39. Improving ___ leads to more flexible queries.






40. An ERM is not dependent on the ____________.






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






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






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






44. A ___________ must not contain a repeating group .






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






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






47. 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.






48. A ______ attribute can have only one value.






49. 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.






50. 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 ____.