Discussion
Correlated subqueries are similar to a regular subquery.
Answer: B
Correct answer: False
The two are quite different. A regular subquery is independent and evaluated once; a correlated subquery references the outer query and must be re-evaluated for every candidate row. The difference shows in the processing order, in the cost, and in what each can express - only the correlated form can compare a row against others in the same table.
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