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






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






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






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






5. 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.






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






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






9. Improving ___ leads to more flexible queries.






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






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






12. 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.






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






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






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






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






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






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






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






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






21. 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 ____.






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






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






24. 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 ____.






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






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






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






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






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






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






31. An ERM is not dependent on the ____________.






32. 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.






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






34. A ___________ must not contain a repeating group .






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






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






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






38. A ______ attribute can have only one value.






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






40. ________ cannot be further subdivided.






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






42. 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.






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






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






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






46. Data redundancy produces ____.






47. 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.






48. Another word for existence-independent is ____.






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






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