Discussion
Which is not true of a correlated subquery?
Answer: D
Correct answer: They are very similar to a regular subquery.
This is the false statement. A correlated subquery differs fundamentally: it references a column of the outer query, so it cannot be evaluated independently and must be re-run for every candidate row. The other three are true - EXISTS and NOT EXISTS are the usual form, the processing is nested rather than bottom up, and the construct is exactly what is used to test a functional dependency in the data.
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