Database Redesign
The NOT EXISTS keyword will be true if:

any row in the subquery meets the condition.
neither of these two conditions is met.
both of these two conditions are met.
all rows in the subquery fail the condition.

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Database Redesign
Which is not true of a correlated subquery?

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

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