Mysql 根据条件更新SQL表。

这是我的桌子结构

Teams (Table Name) 
TeamID      TeamName       TotalScore 
01          Cowboys        6 
02          Bulldogs 
03          Broncos 
04          Raiders

Games (Table Name) 
GameID    team1     team2     team1score team2score Winner GameStart            Status 
01        01        03                                     02/04/2014 07:00:00    0 
02        02        04        6          10         04     03/04/2014 05:30:00    2

Users (Table Name) 
userID      Username      Password    Main Team   Points 
01          Brodey        abc         02          3

Tips (Table Name) 
TipID     userID      GameID       TippedTeam 
01        01          01           02 
02        01          02           03

如果

游戏状态=2

检查

提示

。如果

TippedTeam

与

Games

中的获胜者匹配，则更新

用户积分+3

。如果获胜者不匹配，请不要更新

我试过这个，但不起作用：

update users as u,  tips as t 
set u.points = u.points +3
where u.userid = t.userid 
and tips.tippedteam = (select winner from games where status=2)

---

请帮助加入所有3个表，尝试以下操作：

update users as u, tips, games as g
set u.points = u.points + 3 
where u.userid = tips.userid 
and tips.gameid = g.gameid
and tips.tippedteam = g.winner 
and g.status=2

update teams
join games
on teams.teamID = games.team1
set totalscore = CASE WHEN teams.teamID = games.team1 THEN IFNULL(TotalScore,0)+games.team1score ELSE TotalScore END
where games.status = 2;

update teams
join games
on teams.teamID = games.team2
set totalscore = CASE WHEN teams.teamID = games.team2 THEN IFNULL(TotalScore,0)+games.team2score ELSE TotalScore END
where games.status = 2

对于您的第二个请求（在评论中提出），请尝试以下操作：

update users as u, tips, games as g
set u.points = u.points + 3 
where u.userid = tips.userid 
and tips.gameid = g.gameid
and tips.tippedteam = g.winner 
and g.status=2

update teams
join games
on teams.teamID = games.team1
set totalscore = CASE WHEN teams.teamID = games.team1 THEN IFNULL(TotalScore,0)+games.team1score ELSE TotalScore END
where games.status = 2;

update teams
join games
on teams.teamID = games.team2
set totalscore = CASE WHEN teams.teamID = games.team2 THEN IFNULL(TotalScore,0)+games.team2score ELSE TotalScore END
where games.status = 2

将更新查询（如上）合并为一个：

update teams
join games
on (teams.teamID = games.team1 or teams.teamID = games.team2)
set totalscore = 
      CASE 
      WHEN teams.teamID = games.team1 THEN IFNULL(TotalScore,0)+games.team1score 
      WHEN teams.teamID = games.team2 THEN IFNULL(TotalScore,0)+games.team2score 
      ELSE TotalScore 
      END
where games.status = 2

---

你好，我还有一个问题…我也写不出来。。。当游戏中的状态=2时，每次都需要用team1score更新team1，用team2score和+更新team2。不是替换而是增加，例如本场比赛6个进球，但下一场比赛10个，总分应该是16。你能帮我解决这个问题吗query@AnkurDhanuka当然可以，但我不能完全理解你的第二个要求。请使用链接在您的问题中添加更多详细信息（包括样本数据和预期结果）。谢谢。在此数据库中…我们有gameid 02，其状态为2…现在应该发生什么…team1为02，team1score为6…此分数应添加到团队表中，即在团队表中，分数为0的teamsID 02将变为0+6…对于团队2和team2score@AnkurDhanuka我已经更新了上面的答案，询问您的第二个请求。我还没有测试过，让我知道它是否适合你。