Which of the following best describes the problem this query solves?

SELECT year
FROM year
WHERE year NOT IN
(
SELECT year
FROM gift
WHERE year.year = gift.year
);

Question

Which of the following best describes the problem this query solves?

SELECT year
    FROM year
    WHERE year NOT IN
        (
        SELECT year
            FROM gift
            WHERE year.year = gift.year
        );

BlackTom AI · Accepted Answer

We start by parsing what the query does: it selects years from the Year table for which there is no matching year in the Gift table, using a NOT IN subquery.
Option 1: 'List all years for which no donations have been collected.' This aligns with the structure: we pull years that do not appear in the Gift table’s year column, indicating no donations recorded for those years. The logic and intent match the NOT IN pattern against gift.year.
Option 2: 'List all years in which at least one donation has been collected.' This would require selecting years that DO appear in the Gift table, typically using an inner join or a WHERE year IN (SELECT year FROM gift). The NOT IN condition in the query contradicts this, so this option describes the opposite outcome.
Option 3: 'List all years that appear in the Gift table but not in the Year table.' This is the classic anti-join scenario in the opposite direction: it would require selecting from Gift and comparing to Year, or using NOT IN on the Year table against Gift, depending on the join direction. As written, the query selects from Year, not Gift, so this misstates the source and target of the comparison.
Option 4: 'List all years in which donations were collected from every donor.' This expresses a condition about donors and complete coverage within a year, which would require aggregations over donors and a count equals total donors, not a simple NOT IN subquery comparing years across two tables. The given query has nothing to do with donor-level completeness, so this option describes an unrelated goal.
In summary, the query focuses on identifying Year records with no corresponding Gift records, i.e., years with no donations. The remaining options describe different, incorrect interpretations of the data relationship or different analytical goals.

Which of the following best describes the problem this query solves? SELECT year FROM year WHERE year NOT IN ( SELECT year FROM gift WHERE year.year = gift.year );单项选择题

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