DATABASE DESIGN USING NORMALIZATION QUIZ

Eliminating modification anomalies is a(n) ________ of normalization.

neither an advantage nor disadvantage

either an advantage or disadvantage

disadvantage

advantage

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Denormalized tables are in BCNF.

True

False

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Read-only databases are ________ updated.

seldom

commonly

always

never

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

first step.

third step.

fourth step.

second step.

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

fourth step.

first step.

second step.

third step.

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Most of the time, modification anomalies cause problems that are severe enough that a table should be normalized into BCNF.

True

False

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When building a database from an existing set of tables, we still need to consider normalization principles.

False

True

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

Three columns have the values 534-2435, 534-7867, and 546-2356 in the same row.

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.

One row has the value "He is interested in a Silver Porsche from the years 1978-1988" in a column.

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

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.

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.

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Multivalued dependencies create harmless anomalies that should be noted, but do not always need to be eliminated.

False

True

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