operand should contain 1 columns [duplicate]

霸气de小男生 提交于 2019-12-02 03:59:07

问题


SELECT topic_id
FROM phpbb_topics AS t
WHERE t.topic_id IN (
    SELECT p.topic_id, COUNT(p.post_id) AS total_posts
    FROM phpbb_posts AS p
    WHERE p.poster_id = 61640
    GROUP BY p.topic_id
    HAVING t.topic_replies_real = total_posts - 1
);

That query gets me the following error:

Error Code: 1241. Operand should contain 1 column(s)

Any ideas?


回答1:


You shouldn't include COUNT(p.post_id) AS total_posts in SELECT list in your subquery. Just

SELECT topic_id   
FROM phpbb_topics AS t
WHERE t.topic_id IN (
    SELECT p.topic_id --, COUNT(p.post_id) AS total_posts 
    FROM phpbb_posts AS p
    WHERE p.poster_id = 61640
    GROUP BY p.topic_id
    HAVING t.topic_replies_real = COUNT(p.post_id) - 1
);


来源:https://stackoverflow.com/questions/13781267/operand-should-contain-1-columns

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