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






2. ____ yields better performance.






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






4. A ___________ must not contain a repeating group .






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






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






7. 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.






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






9. Data redundancy produces ____.






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






29. 1NF - 2NF - and 3NF are _____.






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






31. 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.






32. An ERM is not dependent on the ____________.






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






34. 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.






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






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






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






38. 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.






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






40. 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.






41. Improving ___ leads to more flexible queries.






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






43. ________ cannot be further subdivided.






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






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






46. 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 ____.






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






48. Another word for existence-independent is ____.






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






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