WordPress的 - 获取帖子数量和白天的评论

我需要重量多少活动已经在一个WordPress的博客。假设有一天有3个帖子和10个评论，评论中评为10分，评论评分仅为1分，然后说当天共有40分。但是，可能会有几天没有发布任何活动或没有评论活动。WordPress的 - 获取帖子数量和白天的评论

我的第一个想法是从帖子到评论表的一个简单的LEFT JOIN。但是，这将排除没有帖子的日子。我不是MySQL大师，但我一直在研究，似乎解决这个问题的最好方法是使用FULL OUTER JOIN（explained by Jeff Atwood），但MySQL不支持这一点！

然后，实际上有a workaround，但它不适合我。看起来RIGHT OUTER JOIN没有返回我所需要的。
这是LEFT之一，它的作品相当不错。

SELECT 
    DISTINCT DATE(post_date) AS day, 
    COUNT(ID) AS post_total, 
    COUNT(comment_ID) as comment_total, 
    (COUNT(ID)*10 + COUNT(comment_ID)*1) AS total 
FROM wp_posts 
    LEFT OUTER JOIN wp_comments ON 
     DATE(post_date) = DATE(comment_date) 
GROUP BY day ORDER BY total DESC

但是RIGHT之一有问题。

SELECT 
    DISTINCT DATE(post_date) AS day, 
    COUNT(ID) AS post_total, 
    COUNT(comment_ID) as comment_total, 
    (COUNT(ID)*10 + COUNT(comment_ID)*1) AS total 
FROM wp_posts 
    RIGHT OUTER JOIN wp_comments ON 
     DATE(post_date) = DATE(comment_date) 
GROUP BY day ORDER BY total DESC

因此，UNION解决方法是无用的。

我在做什么错？有没有更简单的方法来做到这一点？

谢谢。

注意：您必须在不同日期添加一些帖子和评论。

来源

2011-02-11 metrobalderas

除非你犯了一个错字，当你转录本，问题与你的右连接是它是一个左连接... – 2011-02-11 23:37:55

我觉得这是不是你可以写的最好的查询，但似乎工作

CREATE VIEW commentsCount (date, counter) AS 
SELECT 
    DISTINCT DATE(comment_date) AS date, 
    IFNULL(COUNT(comment_ID),0) AS total 
FROM wp_comments 
GROUP BY date ORDER BY total DESC

CREATE VIEW postsCount (date, counter) AS 
SELECT 
    DISTINCT DATE(post_date) AS date, 
    IFNULL(COUNT(ID),0) AS total 
FROM wp_posts 
GROUP BY date ORDER BY total DESC

SELECT 
    postsCount.date, 
    IFNULL(postsCount.counter,0), 
    IFNULL(commentsCount.counter,0), 
    (IFNULL(postsCount.counter,0)*10 + IFNULL(commentsCount.counter, 0)) 
FROM commentsCount RIGHT JOIN postsCount 
    ON DATE(postsCount.date) = DATE(commentsCount.date) 
GROUP BY postsCount.date 
union 
SELECT 
    commentsCount.date, 
    IFNULL(postsCount.counter,0), 
    IFNULL(commentsCount.counter,0), 
    (IFNULL(postsCount.counter,0)*10 + IFNULL(commentsCount.counter, 0)) 
FROM commentsCount LEFT JOIN postsCount 
    ON DATE(postsCount.date) = DATE(commentsCount.date) 
GROUP BY commentsCount.date

来源

2011-02-28 20:13:20 Alessandro

WordPress的 - 获取帖子数量和白天的评论

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