Question

创建一个mySQL查询来计算包含每个游戏结果的表中的胜负，我遇到了一些麻烦。该表看起来像：

Season | winning_team | losing_team | winning_points | losing_points
 2003        1101          1102             65              45 
 2003        1104          1101             72              70
 2004        1102          1103             88              63

我希望得到一些看起来像的东西：

Season | team | wins | losses
 2003    1101    22      4
 2004    1101    12      16
 2003    1102    14      14

我真的不知道该怎么办。我可以得到刚刚获胜或只是失败的查询结果，但我似乎无法做到这两点。第一个查询获得获胜次数：

SELECT Season, winning_team, COUNT(winning_points) as wins
FROM cbb.regular_season
GROUP BY Season, winning_team

返回（示例）：

Season | winning_team | wins
 2003        1101        22      
 2004        1101        12      
 2003        1102        14

这第二次失败了：

SELECT Season, losing_team, COUNT(losing_points) as losses
FROM cbb.regular_season
GROUP BY Season, losing_team

返回（示例）：

Season | losing_team | losses
 2003        1101        3      
 2004        1101        16      
 2003        1102        14

我想将它们组合在一起，这样我就可以得到每个赛季的赛季，球队以及每个赛季的输赢数。

Answer 1

select
    season, team,
    count(case when outcome = 'W' then 1 else null end) as wins,
    count(case when outcome = 'L' then 1 else null end) as losses
from
    (
    select season, winning_team as team, 'W' as outcome from cbb.regular_season union all
    select season, losing_team as team, 'L' as outcome from cbb.regular_season
    ) as games
group by season, team

Answer 2

你有正确的中间步骤。现在你需要将它们组合在一起：

SELECT wins.Season
, wins.team
, wins.wins
, loses.loses
FROM (
    SELECT Season
    , winning_team as team
    , COUNT(1) as wins
    FROM cbb.regular_season
    GROUP BY Season, winning_team
) as wins
, (
    SELECT Season
    , losing_team
    , COUNT(1) as losses
    FROM cbb.regular_season
    GROUP BY Season, losing_team 
) as loses
WHERE wins.Season = loses.Season
AND wins.team = loses.team

我没有尝试过，但它应该有效

修改

正如评论中所提到的，如果一支球队只输了或只赢了，这将无效。

SQL - 计算胜利和损失

2 个答案:

修改