DATABASE REDESIGN QUIZ

Dependency graphs are diagrams that consist of nodes and arcs that show the dependencies of a database.

False

True

TRUE ANSWER : ?
YOUR ANSWER : ?

Information systems and organizations do not just influence each other; they create each other.

False

True

TRUE ANSWER : ?
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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.

skeptical

optimistic

ambivalent

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

The EXISTS keyword will be true if:

all rows in the subquery fail the condition only.

any row in the subquery meets the condition only.

neither of these two conditions is met.

both of these two conditions are met.

TRUE ANSWER : ?
YOUR ANSWER : ?

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

True

False

TRUE ANSWER : ?
YOUR ANSWER : ?

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

True

False

TRUE ANSWER : ?
YOUR ANSWER : ?

Because of the need for extensive knowledge of SQL, many database developers choose to automate the redesign process.

False

True

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following modifications may not succeed?

Changing a column data type from char to date

Changing a column data type from numeric to char

Both of the above actions should succeed

Neither of the above actions will succeed

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Two

Three

One

Four

TRUE ANSWER : ?
YOUR ANSWER : ?

A regular subquery is processed from the bottom up.

True

False

TRUE ANSWER : ?
YOUR ANSWER : ?

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