仅抓取 phpbb 类别中所有主题的最后一篇文章

发布于 2024-08-11 07:00:20 字数 352 浏览 4 评论 0原文

我只想在单个查询中从 phpbb 数据库中获取某个类别（类别 -> 论坛 -> 主题 -> 帖子）中所有主题的最后一篇文章。目前我已经编写了这个，但它只返回第一篇文章，而不是最后一篇。

SELECT *, MAX(p.post_id)
FROM phpbb_forums f, phpbb_topics t, phpbb_posts p
WHERE f.parent_id IN (<categories>)
AND t.forum_id = f.forum_id
AND p.topic_id = t.topic_id
GROUP BY p.topic_id

有人知道如何正确执行此操作吗？

原文

I want to only grab the last post of all topics in a category (Category->Forum->Topic->Post) from a phpbb database in a single query. Currently I have cooked up this, but it returns only the first post, not the last.

SELECT *, MAX(p.post_id)
FROM phpbb_forums f, phpbb_topics t, phpbb_posts p
WHERE f.parent_id IN (<categories>)
AND t.forum_id = f.forum_id
AND p.topic_id = t.topic_id
GROUP BY p.topic_id

Does anybody know how to correctly do this?

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谁人与我共长歌 2024-08-18 07:00:20

SELECT  *
FROM    phpbb_forums f
JOIN    phpbb_topics t
ON      t.forum_id = f.forum_id
JOIN    phpbb_posts p
ON      p.post_id = 
        (
        SELECT  pi.post_id
        FROM    phpbb_posts pi
        WHERE   pi.topic_id = t.topic_id
        ORDER BY
                pi.date DESC
        LIMIT 1
        )
WHERE   f.parent_id IN (…)

SELECT  *
FROM    phpbb_forums f
JOIN    phpbb_topics t
ON      t.forum_id = f.forum_id
JOIN    phpbb_posts p
ON      p.post_id = 
        (
        SELECT  pi.post_id
        FROM    phpbb_posts pi
        WHERE   pi.topic_id = t.topic_id
        ORDER BY
                pi.date DESC
        LIMIT 1
        )
WHERE   f.parent_id IN (…)

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