DATABASE REDESIGN QUIZ

It is not easy to build a database correctly the first time.

False

True

TRUE ANSWER : ?
YOUR ANSWER : ?

Adding null columns to a table is straightforward.

False

True

TRUE ANSWER : ?
YOUR ANSWER : ?

A tool that can help designers understand the dependencies of database structures is a:

dependency graph.

data model.

graphical display.

None of these

TRUE ANSWER : ?
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Correlated subqueries are similar to a regular subquery.

True

False

TRUE ANSWER : ?
YOUR ANSWER : ?

A regular subquery is processed from the bottom up.

True

False

TRUE ANSWER : ?
YOUR ANSWER : ?

A correlated subquery is processed as a nested subquery.

True

False

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YOUR ANSWER : ?

The EXISTS keyword will be true if any row in the subquery meets the condition.

False

True

TRUE ANSWER : ?
YOUR ANSWER : ?

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

One

Four

Three

Two

TRUE ANSWER : ?
YOUR ANSWER : ?

The EXISTS keyword will be true if:

neither of these two conditions is met.

all rows in the subquery fail the condition only.

any row in the subquery meets the condition only.

both of these two conditions are met.

TRUE ANSWER : ?
YOUR ANSWER : ?

Database redesign is especially difficult if the database has no data.

False

True

TRUE ANSWER : ?
YOUR ANSWER : ?

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