Database Redesign
Which is not true of a correlated subquery?

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

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Database Redesign
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.

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