MSQL计为获奖者，包括0名获奖者

Question

我的查询有问题。我最近刚开始使用SQL。在下面的第一个表格中，我想计算获胜最多的球队数量，也包括获胜次数为零的球队。表格名称以红色突出显示。

我希望查询结果看起来像是我附加的第二张图片，还是这样

Phenix  2
StarWar 1
Strack  1
Serious 0
Apolo   0
APTX    0
Poki    0

到目前为止，我最好的查询是：

   SELECT t1.Team_Name
        , COUNT(winner) AS TotalWins
     FROM result r 
LEFT JOIN team_1 t1
       ON r.Team1_ID = t1.Team1_ID
 GROUP BY winner

          UNION

   SELECT t2.Team_Name
        , COUNT(distinct winner) AS TotalWins
     FROM result r 
LEFT JOIN team_2 t2
       ON r.Team2_ID = t2.Team2_ID
 GROUP BY Winner
 ORDER BY TotalWins DESC;

我得到的结果不包括零获胜的球队，它只会为所有球队加1。

Answer 1

先将team表合并，然后再加入结果表，然后可以使用sum()函数来获取total wins。

select t1.Team_Name, sum(case when coalesce(t2.battle_no, '') = '' then 0 else 1 end) as TotalWins
from (select Team_Name, team1_id as id from team_1
    union all 
    select Team_Name, team1_id as id from team_1) t1
left join result t2 on t2.Team2_ID = t1.team1_id or t2.Team1_ID = t1.team1_id

Answer 2

将左表从结果更改为两个团队的团队

SELECT t1.Team_Name, COUNT(winner) AS TotalWins
     FROM team_1 t1 LEFT JOIN  result r 
    ON r.Team1_ID = t1.Team1_ID
    GROUP BY winner
    UNION
    SELECT t2.Team_Name, COUNT(distinct winner) AS TotalWins
    FROM team_2 t2 LEFT JOIN  result r
    on r.Team2_ID = t2.Team2_ID
    GROUP BY Winner
    ORDER BY TotalWins DESC