查询多个计数值

Question

SELECT  cm.commenter_id,
        cm.comment,
        m.id,
        (
            SELECT COUNT(*) AS r_count
            FROM comments
            GROUP BY comments.commenter_id
        ) AS count,
        m.display_name
FROM    comments cm
        INNER JOIN members m
            ON cm.commenter_id = m.id

从此查询中，我想获取具有最高评论数的人的display_name。任何指导都表示赞赏。

Answer 1

SELECT  m.id, m.display_name, COUNT(*) totalComments
FROM    comments cm
        INNER JOIN members m
            ON cm.commenter_id = m.id
GROUP   BY m.id, m.display_name
HAVING  COUNT(*) =
    (
        SELECT  COUNT(*) totalCount
        FROM    Comments
        GROUP   BY  commenter_id
        ORDER   BY totalCount DESC
        LIMIT 1
    )

• SQLFiddle Demo
• SQLFiddle Demo (with duplicates)

Answer 2

我认为最简单的方法就是对查询进行排序并占据第一行：

SELECT  cm.commenter_id,
        cm.comment,
        m.id,
        (
            SELECT COUNT(*) AS r_count
            FROM comments
            GROUP BY comments.commenter_id
        ) AS count,
        m.display_name
FROM    comments cm
        INNER JOIN members m
            ON cm.commenter_id = m.id
order by count desc
limit 1