When using queries with EXISTS and NOT EXISTS,the processing of the associated SELECT statements must be nested.

Name: When using queries with EXISTS and NOT EXISTS,the processing of the associated SELECT statements must be nested.
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When using EXISTS and NOT EXISTS, the processing of the associated SELECT statements must be nested within the main query. This means that the subquery (SELECT statement) is executed for each row of the main query.

When Using Queries with EXISTS and NOT EXISTS,the Processing of the Associated