Sql 如何检索与特定WHERE条件匹配的每组记录的计数？

让你知道我想做什么。简化的表格结构为：

homeTeamName | awayTeamName | homeTeamGoals | awayTeamGoals
-----------------------------------------------------------
Team1        | Team2        |      4        |       3
Team1        | Team3        |      0        |       1
Team3        | Team2        |      0        |       0

数据来自一场足球比赛。我试图做的是检索“表单”团队，即赢得最多比赛的团队（假设上表中充满了更多数据）。如果我想检索特定团队的“赢数”，那么查询就相当简单，如下所示

SELECT COUNT(*) as winCount FROM matches_new 
  WHERE (
      homeTeamName = 'Team1' AND 
      homeTeamGoals > awayTeamGoals
    ) OR (
      awayTeamName = 'Team1' AND 
      awayTeamGoals > homeTeamGoals
    )
  ORDER BY winCount DESC LIMIT 1

该查询将返回特定团队将获得的“胜利”数量。现在，我想做的是让我的查询检查所有团队，然后返回“胜利”最多的团队的名称以及“胜利”的数量（胜利计数）

我真的不知道该怎么做！我尝试了很多搜索，但很难想象人们会如何描述这种类型的任务，或者想到任何类似的事情。我的问题似乎源于这样一个事实：我不知道如果不具体说明一个值应该等于什么，您将如何执行WHERE子句

谢谢。

试试这个

select teamname, count(*) winCount from 
(
select case when homeTeamGoals > awayTeamGoals then hometeamname
            when wayTeamGoals > homeTeamGoals then awayTeamName end Teamname
from matches_new
where (homeTeamGoals > awayTeamGoals or wayTeamGoals > homeTeamGoals)
)
group by teamname
ORDER BY winCount DESC LIMIT 1

---

您可以通过案例陈述来实现：

select winningTeam, count(*) as winCount from (
    select case 
             when homeTeamGoals > awayTeamGoals then homeTeamName
             when awayTeamGoals > homeTeamGoals then awayTeamName
             else null
           end as winningTeam
        from matches_new
  ) winners
  where winningTeam is not null
  group by winningTeam
  order by winCount desc limit 1

或者你可以通过工会来解决这个问题：

SELECT teamName, COUNT(*) as winCount from (
     select homeTeamName as teamName from  matches_new 
        WHERE homeTeamGoals > awayTeamGoals
     union all
     select awayTeamName as teamName from  matches_new 
        WHERE awayTeamGoals > homeTeamGoals
  ) as allWinners
  GROUP BY teamName
  ORDER BY winCount DESC LIMIT 1

---

谢谢你，丹。这在我的头脑中是有道理的，所以如果有人能投赞成票，那就太好了！正如预期的那样。第二条路是我选择的。如此接近，我不打算发布我的。嗨，丹，我也在努力寻找一支球队的“真正”形式，所以它包括胜利和平局。例如，一场胜利是1分，一场平局是0.5分。因此，它将返回，比如说5支球队，按形式排列（3胜1平=3.5等）。您建议采用什么样的结构？同样，我对如何创建新的“变量”没有任何经验。在OOP中，我当然不会有问题，但SQL有时确实让我感到困惑！