Questions and answers for exam Preparation

MCQs

Total Questions : 40 | Page 2 of 4 pages

Question 11. Each answer below shows example data from a table. Which answer is an example of the missing values problem?

One row has the value "He is interested in a Silver Porsche from the years 1978-1988" in a column.
Three rows have the values Brown, NULL, and Blue in the same column.
Three columns have the values 534-2435, 534-7867, and 546-2356 in the same row.
Three rows have the values Brown Small Chair, Small Chair Brown, and Small Brown Chair in the same column.

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Answer: Option B. -> Three rows have the values Brown, NULL, and Blue in the same column.

Question 12. When assessing the table structure of an acquired set of tables with data, counting the number of table rows is (part of) the:

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Answer: Option B. -> first step.

Question 13. When assessing the table structure of an acquired set of tables with data, determining functional dependencies is (part of) the:

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Answer: Option D. -> second step.

Question 14. If a table has been normalized so that all determinants are candidate keys, then that table is in:

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Answer: Option B. -> BCNF.

Question 15. Each answer below shows example data from a table. Which answer is an example of the multivalue, multicolumn problem?

Three rows have the values Brown, NULL, and Blue in the same column.
Three rows have the values Brown Small Chair, Small Chair Brown, and Small Brown Chair in the same column.
Three columns have the values 534-2435, 534-7867, and 546-2356 in the same row.
One row has the value "He is interested in a Silver Porsche from the years 1978-1988" in a column.

Discuss Question

Answer: Option C. -> Three columns have the values 534-2435, 534-7867, and 546-2356 in the same row.

Question 16. When assessing the table structure of an acquired set of tables with data, determining primary keys is (part of) the:

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Answer: Option B. -> second step.

Question 17. Needing to assess the validity of assumed referential integrity constraints on foreign keys is a(n) ________ of normalization.

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Answer: Option D. -> neither an advantage nor disadvantage

Question 18. Each answer below shows example data from a table. Which answer is an example of the inconsistent values problem?

Three rows have the values Brown Small Chair, Small Chair Brown, and Small Brown Chair in the same column.
Three rows have the values Brown, NULL, and Blue in the same column.
One row has the value "He is interested in a Silver Porsche from the years 1978-1988" in a column.
Three columns have the values 534-2435, 534-7867, and 546-2356 in the same row.

Discuss Question

Answer: Option A. -> Three rows have the values Brown Small Chair, Small Chair Brown, and Small Brown Chair in the same column.

Question 19. Read-only databases are ________ updated.