Wordpress - 按天获取帖子和评论的数量答案

【问题标题】：Wordpress - Get number of posts AND comments by dayWordpress - 按天获取帖子和评论的数量
【发布时间】：2011-06-25 20:31:49
【问题描述】：

我需要衡量 Wordpress 博客中的活动量。比如说，某天有3个帖子，10个cmet，一个帖子的积分是10分，评论只有1分，那么说一天总共有40分。但是，有些日子可能没有发布活动或没有评论活动。

我的第一个想法是一个简单的LEFT JOIN 从帖子到 cmets 表。但是，这将排除没有帖子的日子。我不是 MySQL 专家，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 不支持这个！

然后，实际上有a workaround，但它对我不起作用。 RIGHT OUTER JOIN 似乎没有返回我需要的内容。
这是LEFT 一个，效果很好。

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 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。

我做错了什么？有没有更简单的方法来做到这一点？

谢谢。

注意：您必须在不同的日期添加一些帖子和 cmets。

【问题讨论】：

除非您在转录时打错字，否则您的 RIGHT JOIN 的问题是它是 LEFT JOIN...
是的，这是一个错字。对不起。

标签： php mysql wordpress join

【解决方案1】：

我认为这不是你能写的最好的查询，但似乎可以工作

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

【讨论】：