Question

有两行的最高值为5，但下面的查询只返回最后一个最高记录...如何获得具有最高成员值的所有行？

我可以使用max is where子句plz帮助吗？

SELECT teamcode,MAX(member) AS members FROM(
    SELECT t.`teamcode` AS teamcode,
    COUNT(*) AS member
    FROM `users` u
    JOIN teams t
    ON u.teamcode=t.tm_id
    GROUP BY `teamcode`
) AS maxcount

如何获得所有最高价值？

Answer 1

~~从WHERE子句中获取具有最大值的行可能会更好，例如： WHERE member = MAX(member)而不是在SELECT子句中尝试这样做。~~

编辑：我在这里扩展了我对SQL的了解，但试试这个：
SELECT teamcode, member FROM( SELECT t.'teamcode' AS teamcode, COUNT(*) AS member FROM 'users' u JOIN teams t ON u.teamcode = t.tm_id GROUP BY 'teamcode' HAVING member = MAX(member) ) AS maxcount

Answer 2

首先，因为您只想使用团队代码进行统计：您不需要使用JOIN！但是，你需要一个帮助表。

  SELECT teamcode,
         COUNT(*) as members
    FROM users
GROUP BY teamcode
  HAVING COUNT(*) = (   SELECT COUNT(*)
                          FROM users
                      GROUP BY teamcode
                      ORDER BY COUNT(*) DESC
                         LIMIT 1             );

SQL-Fiddle，如果您愿意的话。

二手参考： SQL Query of Using Functions - How to get MAXIMUM Count of the list

Answer 3

如果您不仅需要查询中的最大值，最好使用GROUP BY。

SELECT teamcode,MAX(member) AS members FROM(
    SELECT t.`teamcode` AS teamcode,
    COUNT(*) AS member
    FROM `users` u
    JOIN teams t
    ON u.teamcode=t.tm_id
    GROUP BY `teamcode`
) AS maxcount
GROUP BY teamcode

如果你想要两个五个最高值，你应该使用“LIMIT”一词。

多个最高记录mysql

3 个答案: