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. 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.






2. Data redundancy produces ____.






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






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






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






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






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






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






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






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






11. A ___________ must not contain a repeating group .






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






13. An ERM is not dependent on the ____________.






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






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






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






17. 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.






18. 1NF - 2NF - and 3NF are _____.






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






20. 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.






21. 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.






22. 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 ____.






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






24. 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.






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






26. ____ yields better performance.






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






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






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






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






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






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






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






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






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






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






37. 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.






38. Another word for existence-independent is ____.






39. 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.






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






41. A ______ attribute can have only one value.






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






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






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






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






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






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






48. ________ cannot be further subdivided.






49. Improving ___ leads to more flexible queries.






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