選擇計數MAX（）（）

Question

可能重複：
every derived table must have its own alias

我需要找到最大的每用戶行爲

表列：action_id，action_status，user

請求：

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

錯誤信息：「每一個派生的表必須有它自己的別名」

什麼是錯的..

Answer 1

這只是意味着MySQL的堅持，你給內SELECT一個名字，怎麼樣？ ：

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