分类表选择语句

Question

我正在开发一个足球联盟，其中的队伍是由计算机随机完成的。 这个联盟排名球员而不是球队。 每位玩家根据游戏结果得分：

his team wins : player scores 3 point
his team wins >5 goals difference: player scores 4 points
his team draws: player scores 1 point
his team loses: player doesnt score

为了存储联盟数据，我在mySQL InnoDB中创建了这些表：

game (id)
player (num, name)
team (game.id, player.num, type)
goals (time, team.id, team.num, team.type)

type - 标识哪个团队是玩家（CHAR“A”或“B”）

• 我想根据上面的规则检索分类，我应该如何在mySQL中编写查询？
• 我避免存储可以计算的数据（良好实践），但是我应该更改表结构吗？

Answer 1

SUM(CASE WHEN a THEN 3
         WHEN b THEN 4
         WHEN c THEN 5
         WHEN d THEN 1
                ELSE 0 END) ttl