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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. 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.






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






3. Another word for existence-independent is ____.






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






5. Data redundancy produces ____.






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






7. 1NF - 2NF - and 3NF are _____.






8. 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.






9. 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 ____.






10. An ERM is not dependent on the ____________.






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






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






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






14. 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.






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






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






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






18. 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 ____.






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






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






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






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






23. ____ yields better performance.






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






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






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






27. Improving ___ leads to more flexible queries.






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






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






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






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






32. 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.






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






34. ________ cannot be further subdivided.






35. 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.






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






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






38. 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.






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






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






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






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






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






44. A ___________ must not contain a repeating group .






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






46. A ______ attribute can have only one value.






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






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






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






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







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