Wordpress-日ごとの投稿数とコメント数を取得

これはあなたが書くことができる最高のクエリではないと思いますが、うまくいくようです

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