php - 将第二个重复项发布到表中

Question

我有以下声明

从 weekpicks GROUP BY 团队中选择whatweek、用户名、团队，用户名 HAVING count(*) > 1 ORDER BY 'whatweek' asc

输出将为用户找到表中的所有重复项，但列表不会仅输出第二次出现的情况。有时它会出现第一次出现，而另一些则出现第二次。我需要它只发布第二次出现的情况。

Answer 1

您可以在子查询中计算所需的星期

    SELECT (
        SELECT whatweek 
        FROM weekpicks t
        WHERE t.username = weekpicks.username 
        AND t.team = weekpicks.team
        ORDER BY whatweek DESC 
        LIMIT 1) AS `needed_whatweek`, 
        username, team 
    FROM weekpicks 
    GROUP BY team, username 
    HAVING count(*) > 1 

编辑或者使用 MAX()，我认为它更喜欢:

SELECT MAX(whatweek), username, team FROM weekpicks 
GROUP BY team, username HAVING count(*) > 1