MySQL - 选择语句，按文章的评论数量排序

Question

您好我想做以下事情：

SELECT * FROM tbl_article
JOIN tbl_comments ON tbl_article.id = tbl_comments.article_id
ORDER BY COUNT(tbl_comments.article_id)

有人可以建议我如何让它发挥作用吗？

Answer 1

这应该做的工作：

SELECT 
    tbl_article.*, COUNT(tbl_comments.article_id) as total_comments
FROM 
    tbl_article
LEFT JOIN 
    tbl_comments ON tbl_comments.article_id = tbl_article.id
GROUP BY 
    tbl_article.id
ORDER BY 
    COUNT(tbl_comments.article_id)

Answer 2

SELECT * FROM
(
  SELECT tbl_article.id, COUNT(tbl_comments.id) AS CommentCount FROM tbl_article
  LEFT OUTER JOIN tbl_comments ON tbl_article.id = tbl_comments.article_id
  GROUP BY tbl_article.id
) ra
ORDER BY CommentCount DESC

编辑：我更改了连接类型。无论在评论表中是否有相应的条目，都应该出现文章。我们现在也正在对文章表中的id字段进行分组。