DATABASE DESIGN USING NORMALIZATION QUIZ

In all cases, normalization into BCNF is desirable.

False

True

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We use the SQL construct COLUMNS(*) to determine the number and type of columns in a table.

True

False

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

first step.

third step.

second step.

fourth step.

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One common design problem when designing a database from existing data is the presence of inconsistent values in the received data.

False

True

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

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.

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.

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Needing to using more complicated SQL in database applications is a(n) ________ of normalization.

disadvantage

advantage

either an advantage or disadvantage

neither an advantage nor disadvantage

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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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Multivalued dependencies should ________ be eliminated.

seldom

always

commonly

never

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

Three rows have the values Brown, NULL, and Blue in the same column.

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YOUR ANSWER : ?

When building a database from an existing set of tables, we may safely assume that referential integrity constraints have been enforced on the data we are given.

False

True

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