Type II nested queries should not be used for a join operation when the result table contains any columns from the inner query.

Question

Quizplus · Accepted Answer

The reason for not using Type II nested queries for join operation is that it can result in unnecessary repetition of rows in the output. If the result table contains any columns from the inner query, it can cause duplication of results, which can be avoided by using Type I or Type III nested queries for join operations.

Type II Nested Queries Should Not Be Used for a Join