MySQL和過濾但是對於不同的值

Question

我正在寫一個簡單的足球數據庫，該數據庫算起，我希望球隊在歐洲播放，但算上在聯盟勝場數。

團隊可以發揮歐足聯和結果應該是'雙贏「畫」或「失去」

爲了做到這一點，我寫了這個查詢，但我不知道我應該如何改變count語句，因爲此查詢給出在歐足聯參加的每個球隊的比賽數量。

SELECT t.name, count(*) as Wins 
FROM Teams t, Matches m 
WHERE competion = 'UEFA' AND t.name = m.team 
GROUP BY t.name 

Answer 1

有了適當的標準，它看起來像：

SELECT t.name, count(*) as matches, 
sum(case when result = "win" then 1 else 0 end) as wins, 
sum(case when result = "draw" then 1 else 0 end) as draws, 
sum(case when result = "loss" then 1 else 0 end) as losses 
FROM Teams t, Matches m 
WHERE competion = 'UEFA' AND t.name = m.team 
GROUP BY t.name