从count()中选择max()

Question

可能重复:
每个派生表必须有自己的别名

我需要找到每个用户最多的动作

表列:action_id,action_status,user

请求:

SELECT MAX(`counted`) FROM
(
SELECT COUNT(*) AS `counted`
FROM `table_actions`
WHERE `status` = "good"
GROUP BY `user`
)

错误消息:"每个派生表必须有自己的别名"

怎么了？..

Answer 1

这只是意味着MySQL坚持要给内部SELECT一个名字,比如:

SELECT MAX(counted) FROM
(
    SELECT COUNT(*) AS counted
    FROM table_actions
    WHERE status = "good"
    GROUP BY user
) AS counts;