Sql 使用条件显示列值或连接的文本，并按从分组中排除

我目前正在从事一个个人项目，我将雷曼Access棒球数据库转换为MSSQL，并针对它构建功能。我已经成功地转换了数据库，并构建了击球、投球和防守的三个静态视图

我目前正在对击球视图进行查询，以返回符合击球冠军资格的球员列表。这就是我取得的成绩：

SELECT Player, Season, SUM(AB) AS AB, SUM(BB)AS BB, SUM(HBP) AS HBP,
SUM(SH)AS SH, SUM(SF) AS SF, AVG(AVG)AS AVG, AVG(OBP) AS OBP, 
AVG(SLG) AS SLG, AVG(OPS) AS OPS 
FROM View_PlayerBatting 
WHERE Season = '2016' 
GROUP BY Player, Season 
HAVING (SUM(AB) + SUM(BB) + SUM(HBP) + SUM(SH) + SUM(SF)) > 502 
ORDER BY AVG(OPS) DESC

我使用Order By子句对照已验证的主MLB.com检查我的结果

我的问题是，我也希望将球队包括在这个名单上，而且一些球员在赛季中期被交易，所以为了弄清楚预选赛，我不想一个队一个队分组，否则会删除七个合格的结果。但是，如果我尝试向SELECT子句中添加以下内容：

IIF(COUNT(Team) = 1, Team, CAST(COUNT(Team) AS varchar) + ' teams') AS Team 对于我的select子句，它强制我将团队包括在GROUPBY中。如果我试图使用子查询从另一个表返回值，它还强制我按组包含team by，例如：

IIF(COUNT(Team) = 1, (SELECT teamID FROM Teams where TeamID = View_PlayerBatting.Team), ...

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似乎如果我需要知道团队的价值，我必须将其包含在GROUPBY子句中；如果我更改IIF的第一个结果以返回除Team列以外的其他内容，如静态值或字符串，则查询将执行，而不需要Team位于GROUP BY中。如何以我尝试使用的格式返回团队列？

我不熟悉该数据库，但您基本上希望解决每组前1个问题。您可以使用maxTeam，但这可能无法获得您想要的团队

您可以使用cross apply按TradeDate之类的列为每个球员和赛季订购一支球队，如下所示：

如果希望将每个玩家的所有团队值连接起来，可以使用

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也许您可以简化数据，并显示示例数据和期望的结果。实际上，使用MAX解决了这个问题，我没有想到这一点。IIFCOUNTTeam=1，MAXTeam，CASTCOUNTTeam作为Varchar+“teams”作为团队返回团队（如果有一个团队），或者如果有多个团队返回“X个团队”。@K_Cruz太棒了！很高兴你找到了满意的解决办法。我已经更新了我的答案，将连接的团队作为另一种选择。

SELECT Player, Season, x.Team
, SUM(AB) AS AB, SUM(BB)AS BB, SUM(HBP) AS HBP,
SUM(SH)AS SH, SUM(SF) AS SF, AVG(AVG)AS AVG, AVG(OBP) AS OBP, 
AVG(SLG) AS SLG, AVG(OPS) AS OPS 
FROM View_PlayerBatting 
cross apply (
  select top 1
    Team
  from View_PlayerBatting as i 
  where i.Player = View_PlayerBatting.Player
    and i.Season = View_PlayerBatting.Season
  order by TradeDate desc
  ) as x
WHERE Season = '2016' 
GROUP BY Player, Season, x.Team
HAVING (SUM(AB) + SUM(BB) + SUM(HBP) + SUM(SH) + SUM(SF)) > 502 
ORDER BY AVG(OPS) DESC

SELECT Player, Season,
 , Team = stuff((
      select distinct '; '+i.Team
      from View_PlayerBatting as i 
      where i.Player = View_PlayerBatting.Player
        and i.Season = View_PlayerBatting.Season
      for xml path (''), type).value('.','varchar(max)')
    ,1,2,'')
  , SUM(AB) AS AB, SUM(BB)AS BB, SUM(HBP) AS HBP
  , SUM(SH)AS SH, SUM(SF) AS SF, AVG(AVG)AS AVG, AVG(OBP) AS OBP
  , AVG(SLG) AS SLG, AVG(OPS) AS OPS 
FROM View_PlayerBatting 
WHERE Season = '2016' 
GROUP BY Player, Season, x.Team
HAVING (SUM(AB) + SUM(BB) + SUM(HBP) + SUM(SH) + SUM(SF)) > 502 
ORDER BY AVG(OPS) DESC;