Question

我正在尝试从得分保持系统中获取一些个人统计信息。本质上，球队被安排参加比赛

Match
---------
Matchid (uniqueidentifier)
SessionId (int)
WeekNum (int)

这些比赛分为几组，其中团队中的两名特定球员互相比赛

MatchSet
-----------
SetId (int)
Matchid (uniqueidentifier)
HomePlayer (int)
AwayPlayer (int)
WinningPlayer (int)
LosingPlayer (int)
WinningPoints (int)
LosingPoints (int)
MatchEndTime (datetime)

为了允许球员缺席，每场比赛允许球员玩两次。每组的得分将计入其球队总数，但对于个人奖项，仅应计算球员第一次参加比赛。

我一直试图利用CTE为行编号

;WITH cte AS
(
   SELECT *,
       ROW_NUMBER() OVER (PARTITION BY MatchId ORDER BY MatchEndTime) AS rn
   FROM 
       (SELECT 
            SetId, MS.MatchId, WinningPlayer, LosingPlayer, 
            HomePlayer, AwayPlayer, WinningPoints, LosingPoints, MatchEndTime
        FROM 
            MatchSet MS 
        INNER JOIN 
            [Match] M ON M.MatchId = MS.MatchId AND M.[Session] = @SessionId
    )

但是我很挣扎，因为玩家可能是给定场景中的主场球员或客场球员（也可能是赢家或输家）

理想情况下，然后可以基于WinningPlayer或LosingPlayer将这个结果加入到玩家表中，这将使我获得个人排名的列表

Answer 1

也许您可以虚拟化数据的规范化视图并从中删除而不是MatchSet表。

;WITH TeamPlayerMatch AS
(
    SELECT TeamID,PlayerID=WinnningPlayer,MatchID,Points = MS.WinningPoints, IsWinner=1 FROM MatchSet MS INNER JOIN TeamPlayer T ON T.PlayerID=HomePlayer
    UNION ALL
    SELECT TeamID,PlayerID=LosingPlayer,MatchID,Points = MS.LosingPoints, IsWinner=0 FROM MatchSet MS INNER JOIN TeamPlayer T ON T.PlayerID=AwayPlayer
)

,cte AS
(
   SELECT *,
       ROW_NUMBER() OVER (PARTITION BY MatchId ORDER BY MatchEndTime) AS rn
   FROM 
       (SELECT 
            SetId, MS.MatchId, PlayerID, TeamID, Points, MatchEndTime, IsWinner
        FROM 
            TeamPlayerMatch MS 
        INNER JOIN 
            [Match] M ON M.MatchId = MS.MatchId AND M.[Session] = @SessionId
        WHERE
            IsWinner=1
    )

Answer 2

我认为第一步是编写一些CTE，这些CTE会将数据放入一个结构中，在此结构中您可以评估玩家得分而不管赢/输。这是一个可能的开始：

;with PlayersPoints as 
(
   select m.MatchId
        ,m.SessionId 
        ,m.WeekNum
        ,ms.SetId       
        ,ms.WinningPlayer as PlayerId
        ,ms.WinningPoints as Points
        ,'W' as Outcome
        ,ms.MatchEndTime 
    from MatchSet ms
    join Match m on on ms.MatchId = m.MatchId
        and m.SessionId = @SessionId 

   union all 

   select m.MatchId
        ,m.SessionId 
        ,m.WeekNum
        ,ms.SetId   
        ,ms.LosingPlayer as PlayerId
        ,ms.LosingPoints as Points
        ,'L' as Outcome
        ,ms.MatchEndTime 
    from MatchSet ms
   join Match m on on ms.MatchId = m.MatchId
        and m.SessionId = @SessionId 
)
, PlayerMatch as 
(
   select SetId
        ,WeekNum
        ,MatchId
        ,PlayerId
        ,row_number() over (partition by PlayerId, WeekNum order by MatchEndTime) as PlayerMatchSequence
    from PlayerPoints 
)
....

第一个CTE提取每个玩家的得分，第二个CTE识别匹配的人。因此，要计算单个点，您需要查找PlayerMatchSequence = 1。

SQL Server：仅选择具有多个列的记录的第一个实例

2 个答案: