帮助mysql查询

Question

对于这个问题的特殊性我很抱歉，但我已经48小时了，现在我的思绪可能已经无效了。

所以，我有一张桌子 - ＆gt; ID |用户ID |卡
用户可以拥有多张卡

我只需要查询该表以查找具有24个不同卡的用户ID（有重复卡的用户）。

有人能帮助我吗？

谢谢

Answer 1

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

请参阅GROUP BY (Aggregate) Functions

更新以查找包含24张不同卡片的用户：

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

可替换地：

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

Answer 2

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

Answer 3

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