Discussion
A regular subquery can be processed:
Answer: B
Correct answer: from the bottom up.
A regular subquery does not depend on the outer query, so it can be evaluated once, on its own, and its result then used by the query above it - bottom up. A correlated subquery references a column of the outer query and must therefore be re-evaluated for each candidate row, which is why it is described as nested and why it is generally the more expensive of the two.
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