Database Redesign
Database redesign is not terribly difficult if the:

database has no data.
database is structured.
database is well-designed.
database is relatively small.

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Database Redesign
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.

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Database Redesign
Which is not true of a correlated subquery?

They are very similar to a regular subquery.
EXISTS/NOT EXISTS is a form of a correlated subquery.
They can be used to verify functional dependencies.
The processing of the SELECT statements is nested.

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