选择指定年份的结果

Question

我希望以下查询仅选择特定年份的结果。 eventID 与事件日期所在的事件表相关。

冠军排行榜表

 ------------------------------------
 | ID | eventID | playerId | points |
 ------------------------------------

事件表

 ------------------
 | eventID | date |
 ------------------

我无法确定内部连接的放置位置，以便正确引用事件日期

SELECT playerId, SUM(points) top5
FROM
 ( SELECT x.*
        , CASE WHEN @prev = playerId THEN @i:=@i+1 ELSE @i:=1 END i
        , @prev:=playerId
     FROM championshipLeaderboard x
        , (SELECT @prev:=null,@i:=0) vars ORDER BY playerId,points
DESC) a
    WHERE i<=5 AND playerId = 1 AND YEAR(events.date) = YEAR(CURDATE()) 
    GROUP BY playerId
    ORDER BY top5 DESC

见 DB fiddle here

Answer 1

经过一些讨论（见 cmets）我想出了这个：

SELECT top5.playerId, SUM(top5.points) AS sumOfPoints
FROM (
    SELECT playerId, points
    FROM championshipLeaderboard
    INNER JOIN events ON championshipLeaderboard.eventID = events.eventID
    WHERE playerId = 1
    AND YEAR(events.date) = YEAR(CURDATE()) 
    ORDER BY points DESC
    LIMIT 5
 ) AS top5
 GROUP BY top5.playerId

另请参阅：https://www.db-fiddle.com/f/56ApCUAW6QFJ7vNiyLQqaF/5

Answer 2

您可以将内部连接与1=1 一起使用

    SELECT playerId, SUM(points) top5
FROM
 ( SELECT x.*
        , CASE WHEN @prev = playerId THEN @i:=@i+1 ELSE @i:=1 END i
        , @prev:=playerId
     FROM championshipLeaderboard x
     INNER JOIN events y ON x.event_id = y.event_id
     INNER JOIN (SELECT @prev:=null,@i:=0) vars ON 1=1
     WHERE YEAR(y.date) = YEAR(CURDATE())
     ORDER BY playerId,points DESC
 ) a
    WHERE i<=5 AND playerId = 1  
    GROUP BY playerId
    ORDER BY top5 DESC