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16. Read-only databases are ________ updated.
A. always
B. commonly
C. seldom
D. never
17. Needing to assess the validity of assumed referential integrity constraints on foreign keys is a(n) ________ of normalization.
A. advantage
B. disadvantage
C. either an advantage or disadvantage
D. neither an advantage nor disadvantage
18. When assessing the table structure of an acquired set of tables with data, determining primary keys is (part of) the:
A. first step.
B. second step.
C. third step.
D. fourth step.
19. Normalization ________ data duplication.
A. eliminates
B. reduces
C. increases
D. maximizes
20. Each answer below shows example data from a table. Which answer is an example of the inconsistent values problem?
A. Three columns have the values 534-2435, 534-7867, and 546-2356 in the same row.
B. Three rows have the values Brown Small Chair, Small Chair Brown, and Small Brown Chair in the same column.
C. Three rows have the values Brown, NULL, and Blue in the same column.
D. One row has the value “He is interested in a Silver Porsche from the years 1978-1988” in a column.
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