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. An ERM is not dependent on the ____________.






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






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






4. 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.






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






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






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






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






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






10. 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.






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






12. 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 ____.






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






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






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






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






17. 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 ____.






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






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






20. Improving ___ leads to more flexible queries.






21. Data redundancy produces ____.






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






23. 1NF - 2NF - and 3NF are _____.






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






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






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






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






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






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






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






31. 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.






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






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






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






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






36. 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.






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






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






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






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






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






42. Another word for existence-independent is ____.






43. ________ cannot be further subdivided.






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






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






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






47. 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.






48. 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.






49. A ___________ must not contain a repeating group .






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







Sorry!:) No result found.

Can you answer 50 questions in 15 minutes?


Let me suggest you:

Browse all subjects

Browse all tests

Most popular tests



Major Subjects

Tests & Exams


AP
CLEP
DSST
GRE
SAT
GMAT

Browse all subjects

Browse all tests

Most popular tests