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. A ___________ must not contain a repeating group .






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






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






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






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






6. 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.






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






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






9. Data redundancy produces ____.






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






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






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






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






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






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






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






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






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






19. Another word for existence-independent is ____.






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






21. 1NF - 2NF - and 3NF are _____.






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






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






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






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






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






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






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






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






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






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






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






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






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






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






36. 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 ____.






37. 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 ____.






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






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






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






41. 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.






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






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






44. An ERM is not dependent on the ____________.






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






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






47. ________ cannot be further subdivided.






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






49. 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.






50. 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.