操作数应包含1列[重复]

Question

这个问题已经在这里有了答案 ：

操作数应包含1列-MySQL NOT IN （3个答案）

6年前关闭。

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
);

该查询给我以下错误：

错误代码：1241。操作数应包含1列

有任何想法吗？

Answer 1

您不应该在子查询中包括COUNT(p.post_id) AS total_posts在SELECT列表中。只是

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
);