mysql - 如何告诉 SQL 使用另一个表作为输入值来运行命令？

Question

我正在尝试构建一个查询，该查询将显示数据库中每个团队的得分(无论如何作为开始)。我有两张表，一张包含球队列表，一张包含比赛，格式为

周|主队|客队|主场得分|客队得分|结果|比赛ID

结果可以是 A(客场获胜)、H(主场获胜)或 D(平局)。我可以使用

轻松找到给定团队的积分

SELECT
(SELECT COUNT(matches.Result)*3 FROM matches WHERE (HomeTeam='Arsenal' AND Result='H') OR (AwayTeam='Arsenal' AND Result='A')) +
(SELECT COUNT(matches.Result) FROM matches WHERE (HomeTeam='Arsenal' OR AwayTeam='Arsenal') AND Result='D');

我想做的是:

FOR EACH teams.Team in teams
SELECT
(SELECT COUNT(matches.Result)*3 FROM matches WHERE (HomeTeam=Team AND Result='H') OR (AwayTeam=Team AND Result='A')) +
(SELECT COUNT(matches.Result) FROM matches WHERE (HomeTeam=Team OR AwayTeam=Team) AND Result='D');

不幸的是，这不起作用，我不太明白为什么。我做错了什么？

Answer 1

简单使用子查询:

SELECT teams.Team,
((SELECT COUNT(matches.Result)*3 FROM matches WHERE (HomeTeam=teams.Team AND Result='H') OR (AwayTeam=Team AND Result='A')) +
(SELECT COUNT(matches.Result) FROM matches WHERE (HomeTeam=teams.Team OR AwayTeam=teams.Team) AND Result='D')) as Points