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 redundancies occur from ____ of data on every row entry.






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






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






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






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






6. 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.






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






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






9. A ______ attribute can have only one value.






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






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






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






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






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






15. An ERM is not dependent on the ____________.






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






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






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 ___ relationship exists when two entities are associated.






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






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






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






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






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






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






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






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






28. ________ cannot be further subdivided.






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






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






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






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






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






34. A ___________ must not contain a repeating group .






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






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






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






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






39. 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 ____.






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






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






42. ____ yields better performance.






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






44. 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 ____.






45. 1NF - 2NF - and 3NF are _____.






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






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






48. 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.






49. 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.






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