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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






19. An ERM is not dependent on the ____________.






20. 1NF - 2NF - and 3NF are _____.






21. 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.






22. 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.






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






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






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






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






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






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






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






30. 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.






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






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






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






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






35. Improving ___ leads to more flexible queries.






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






37. Data redundancy produces ____.






38. Another word for existence-independent is ____.






39. 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.






40. 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.






41. 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.






42. A ______ attribute can have only one value.






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






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






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






46. 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.






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






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






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






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