Question

我有一个用户表和一个评论表，我想从用户中选择评论表中包含大量评论的顶级用户，并按评论数量排序

表格结构

用户

id | username | password

id | text | author_username

Answer 1

使用以下MySQL语句列出评论最多的用户。 CommentCount会告诉您特定用户发表的评论数量。

SELECT
  users.username,
  COUNT(comments.id) AS CommentCount
FROM
  users
  INNER JOIN comments ON users.id = comments.author_userid
GROUP BY
  users.username
ORDER BY
  COUNT(comments.id) DESC

请注意，您必须先将author_userid更改为author_username！

Answer 2

我的SQL有点生疏，但是这样的东西会给你你想要的东西（虽然我提到过，用户ID应该是comments表中唯一的用户标识符。）

Select count(id), author_username from comments group by author_username

Answer 3

    select u.username,count(c.comments) as total
    from users as u
    left join comments as c
    on u.username = c.author_username
    group by u.username
    order by total desc

我会改变连接字段，因为dutchie432建议。添加限制子句以获得所需的记录数。

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3 个答案: