发布第二个重复表中的

Question

我有下面的语句

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

失认沽将在表中为用户找到所有的重复与但却列表不输出仅第二发生。有时它会发布第一次发生，其他发生第二次发生。我需要它只发布第二个事件。

Answer 1

您可以计算子查询

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 

编辑所需whatweek或者使用MAX（），其preffer我想：

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