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. Improving ___ leads to more flexible queries.






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






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






4. 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 ____.






5. 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.






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






7. An ERM is not dependent on the ____________.






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






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






10. Another word for existence-independent is ____.






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






12. 1NF - 2NF - and 3NF are _____.






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






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






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






16. 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.






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






36. 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.






37. 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.






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






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






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






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






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






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






44. 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.






45. 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.






46. A ___________ must not contain a repeating group .






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






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






49. 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 ____.






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







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