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






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






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






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






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






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






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






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






9. 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 ____.






10. 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 ____.






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






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






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






14. Improving ___ leads to more flexible queries.






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






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






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






18. 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.






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






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






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






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






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






24. 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.






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






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






27. Another word for existence-independent is ____.






28. Data redundancy produces ____.






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






30. 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.






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






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






33. 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.






34. ____ yields better performance.






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






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






37. 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.






38. An ERM is not dependent on the ____________.






39. A ___________ must not contain a repeating group .






40. An attribute that is part of a key is known as a ____ 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. In the ERD - Cardinality is indicated using the ___ notation.






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






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






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






47. ________ cannot be further subdivided.






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






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






50. 1NF - 2NF - and 3NF are _____.