Type II nested queries are very useful for difference problems but should not be used for join problems.

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Quizplus · Accepted Answer

Type II nested queries are indeed useful for difference problems where the goal is to find rows in one table that don't have corresponding rows in another. However, for join problems, where the goal is to combine rows from two or more tables based on a related column, using joins is more appropriate and efficient than nested queries.

Type II Nested Queries Are Very Useful for Difference Problems