查询1表两次，获得2个不同的计数结果

Question

我对复杂的mysql语句的想法非常感兴趣，但我正在努力处理文档。

我有一个足球比赛表基本上是这样的：

match_id | home_team_id | away_team_id | home_score | away_score
----------------------------------------------------------------
    1    | 2            | 3            | 1          | 0        
    2    | 5            | 2            | 0          | 2

我需要做一些查询才能做我想要的事情

1. 为球队效力的总比赛
2. 团队中的总胜利
3. 团队总胜利

我会通过几个艰难的查询来做这件事，然后再处理它们：

SELECT 
    COUNT(match_id), SUM(home_score)
FROM 
    matches 
WHERE 
    home_team_id=2 
AND 
    home_score > away_score

和

SELECT 
    COUNT(match_id), SUM(away_score) 
FROM 
    matches 
WHERE 
    away_team_id=2 
AND 
    away_score > home_score

这似乎是很多小的重复。我以为我可以做这样的工会：

SELECT 
    COUNT(match_id) as home_wins
FROM 
    matches
WHERE 
    home_team_id=2
AND 
    home_score > away_score
UNION ALL
SELECT 
    COUNT(match_id) as away_wins
FROM 
    matches
WHERE 
    away_team_id=2
AND 
    away_score > home_score

哪种方法有效，但我认为它正在合并结果。如何使用一个查询完成？