DATABASE REDESIGN QUIZ

How many copies of the database schema are typically used in the redesign process?

One

Four

Three

Two

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How can you find rows that do not match some specified condition?

NOT EXISTS

Double use of NOT EXISTS

None of these

EXISTS

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Because of the importance of making data model changes correctly, many professionals are ________ about using an automated process for database redesign.

None of these

ambivalent

optimistic

skeptical

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A correlated subquery is processed as a nested subquery.

True

False

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Database redesign is not terribly difficult if the:

database is well-designed.

database has no data.

database is relatively small.

database is structured.

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The NOT EXISTS keyword will be true if:

neither of these two conditions is met.

all rows in the subquery fail the condition.

any row in the subquery meets the condition.

both of these two conditions are met.

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Which of the following SQL statements are helpful in database redesign?

Both of the above are helpful

None of these

Correlated subqueries only

EXISTS/NOT EXISTS expressions only

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If a database is built correctly the first time, it will not have to be redesigned.

True

False

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The data model produced from the reverse engineering process is a true logical model.

True

False

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Reverse engineering is the process of reading a database schema and producing a data model from that schema.

True

False

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