Sql Expert Are There Any Specific Cases Where Using A SQL Correlated Sub-query Is Absolutely Unavoidable?

Are there any specific cases where using a SQL correlated sub-query is absolutely unavoidable? - sql expert

For every expert in SQL ... Are there certain cases in conjunction with a subquery absolutely necessary? In other words, should a sub-correlation of the movements are used and is the only way to find the desired solution. If yes or no, please include a sample (s) declare and logic. Thank you!