Which construct in SQL is used to test whether a subquery has any tuples in…
2009
Which construct in SQL is used to test whether a subquery has any tuples in its result?
Answer: B. EXISTS — The EXISTS operator is used in SQL to test whether a subquery returns any rows. It evaluates to TRUE if the subquery yields at least one tuple, and FALSE…
- A.
UNIQUE
- B.
EXISTS
- C.
GROUP BY
- D.
EXCEPT
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Correct answer: B
The EXISTS operator is used in SQL to test whether a subquery returns any rows. It evaluates to TRUE if the subquery yields at least one tuple, and FALSE otherwise. This construct is specifically designed for existence checks within queries.
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