There is a common trap in writing a correlated subquery,which will cause no rows to ever be displayed in the results.

Name: There is a common trap in writing a correlated subquery,which will cause no rows to ever be displayed in the results.
Brand: Quizplus
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Question

Quizplus · Accepted Answer

This is true. The trap occurs when the subquery is not properly correlated to the main query, causing the subquery to always return null or no rows, resulting in no output from the main query.

There Is a Common Trap in Writing a Correlated Subquery,which