DATABASE REDESIGN QUIZ

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

True

False

TRUE ANSWER : ?
YOUR ANSWER : ?

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

False

True

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Typically, there should be at least two different copies of the database schema used in the redesign process.

False

True

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The EXISTS keyword will be true if:

both of these two conditions are met.

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.

TRUE ANSWER : ?
YOUR ANSWER : ?

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

False

True

TRUE ANSWER : ?
YOUR ANSWER : ?

Which is not true of a correlated subquery?

The processing of the SELECT statements is nested.

They are very similar to a regular subquery.

They can be used to verify functional dependencies.

EXISTS/NOT EXISTS is a form of a correlated subquery.

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 : ?

The SQL-92 command to change a table name is RENAME TABLE.

False

True

TRUE ANSWER : ?
YOUR ANSWER : ?

Adding null columns to a table is straightforward.

True

False

TRUE ANSWER : ?
YOUR ANSWER : ?

Correlated subqueries are similar to a regular subquery.

False

True

TRUE ANSWER : ?
YOUR ANSWER : ?

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