Database Redesign
The EXISTS keyword will be true if:

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

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Database Redesign
Which is not true of a correlated subquery?

EXISTS/NOT EXISTS is a form 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.

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