Question

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
);

该查询遇到以下错误：

错误代码：1241。操作数应包含1列

有什么想法吗？

Answer 1

您不应在COUNT(p.post_id) AS total_posts列表中的SELECT中包含子查询。刚

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
);

操作数应包含1列

1 个答案: