mysql - 从 count() 中选择 max()

Possible Duplicate:
every derived table must have its own alias

我需要找到每个用户的最大操作数

表列:action_id、action_status、user

要求:

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

错误信息:“每个派生表都必须有自己的别名”

怎么了？

最佳答案

这只是意味着 MySQL 坚持要求您为内部 SELECT 命名，例如:

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

关于mysql - 从 count() 中选择 max()，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10363518/