有關mysql查詢的幫助

Question

對於這個問題的特殊性，我很抱歉，但我已經過了48小時，現在我的想法可能是空的。

所以，我有一個表 - > ID |用戶ID |卡
其中一個用戶可以擁有多個卡

我只需要查詢表發現，有整整24不同卡的用戶ID（有用戶重複卡片）。

有人可以幫我嗎？

謝謝

Answer 1

SELECT UserID 
FROM tableName 
GROUP BY UserID 
HAVING COUNT(*) = 24 

見GROUP BY (Aggregate) Functions

更新：地發現，有24張不同的卡的用戶：

SELECT UserID 
FROM (
    SELECT UserID 
    FROM tableName 
    GROUP BY UserID, Card 
) rs 
GROUP BY UserID 
HAVING COUNT(*) = 24 

或者：

SELECT UserID 
FROM tableName 
GROUP BY UserID 
HAVING COUNT(DISTINCT Card) = 24 

Answer 2

select * from 
    (select count(*) cnt,card from tablename group by card) 
where cnt=24 

Answer 3

SELECT userid FROM (
    SELECT userid, count(*) as cnt FROM some_table GROUP BY userid 
) WHERE cnt = 24