Because EXISTS and NOT EXISTS are forms of correlated subqueries,the processing of the associated SELECT statements must be nested.

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EXISTS and NOT EXISTS subqueries are correlated subqueries and their processing involves nesting the associated SELECT statements. This is because the subquery references columns from the outer query, and the database engine must evaluate the subquery for each row of the outer query.

Because EXISTS and NOT EXISTS Are Forms of Correlated Subqueries,the