Question

there cannot be a sub query which is independent of the outer query

Answer 1

This is a false statement because if a subquery uses any reference from the outer query, it is called Independent Subquery.  

Sub query is not used by any outer query and it can also be executed independently.

Answer 2

Answer:

The answer for the above mentioned statement is false. In deed , There are in fact subquery which is independent of the outer query. Such subqueries are possible.

Explanation:

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