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我有一张包含游戏列表的表格，其中包含团队 ID 和游戏得分。

这是表结构。

ID  HOMETEAM    HOMETEAMSCORE   AWAYTEAM    AWAYTEAMSCORE
  • 一场比赛中每支球队的得分将在各自的列中。
  • 比赛未开始时，两队得分均为0。
  • 比赛结束后，任何比赛都不能有0-0的比分。

我需要获得 2 个特定球队的比赛记录。例如，对于 1 队和 2 队，我需要输出为 1-3，这意味着 1 队赢了 1 队 2 队，2 队赢了 3 次队 1。

我正在使用下面的 SQL，它在某种程度上可以工作。但是对于尚未开始的游戏（得分为 0-0），我需要将输出设为 0-0。

SELECT least(homeTeam, awayTeam) team1,
       greatest(homeTeam, awayTeam) team2,
       sum(case when awayTeam > homeTeam
          then case when homeTeamScore > awayTeamScore then 1 else 0 end else case when homeTeamScore > awayTeamScore then 0 else 1 end
       end) team1Wins,
       sum(case when hometeam > awayteam
          then case when homeTeamScore > awayTeamScore then 1 else 0 end else case when homeTeamScore > awayTeamScore then 0 else 1 end
       end) team2Wins
FROM ow_sports_games 
GROUP BY least(homeTeam, awayTeam),
         greatest(homeTeam, awayTeam)

除了这个之外，还有什么更好的方法来获得更好的 SQL 吗？

SQL小提琴：http ://sqlfiddle.com/#!2/10326/4/1

编辑：

一些示例数据可以更详细地解释我的要求：

HOMETEAM    HOMETEAMSCORE   AWAYTEAM    AWAYTEAMSCORE
18          1               22              0
22          2               18              1
18          3               22              2
12          0               13              0

对于 18,22 队，输出应该是 2-1，因为 18 队有 2 胜，22 队有 1 胜

对于第 12 队和第 13 队，输出应该是 0-0，因为没有比赛结束。

输出示例来解释整体场景：

HomeTeam      AwayTeam     Records
18             22          2-1
22             18          1-2
12             13          0-0
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1 回答 1

1

这与您在问题陈述中的输出相匹配（前 3 列是相同的，接下来的两列用于排序并确保我在他们没有播放但有记录时考虑在内。见http://sqlfiddle.com/ #!2/10326/43

SELECT DISTINCT hometeam, awayteam
    , CONCAT(IF(hometeam = LEAST(hometeam, awayteam),team1wins, team2wins),' - ', IF(awayteam = LEAST(hometeam, awayteam),team1wins, team2wins)) AS Head2HeadRecord
    , CONCAT(LEAST(hometeam, awayteam), GREATEST(hometeam, awayteam)) AS surrogateSort
    , notplayed
FROM ow_sports_games 
JOIN (SELECT LEAST(hometeam, awayteam) AS team1
       ,GREATEST(hometeam, awayteam) AS team2
       ,SUM(IF(LEAST(hometeam, awayteam) = hometeam AND homeTeamScore > awayTeamScore, 1,
                IF(LEAST(hometeam, awayteam) = awayteam AND awayTeamScore > homeTeamScore,1,0) 
              )
            ) AS team1Wins
      ,SUM(IF(GREATEST(hometeam, awayteam) = hometeam AND homeTeamScore > awayTeamScore, 1,
                IF(GREATEST(hometeam, awayteam) = awayteam AND awayTeamScore > homeTeamScore,1,0) 
              )
            ) AS team2Wins  
       ,SUM(IF(homeTeamScore=0 AND awayTeamScore=0,1,0)) AS notPlayed
      FROM ow_sports_games 
      GROUP BY team1, team2) AS trecords
  ON LEAST(hometeam, awayteam) = team1
    AND GREATEST(hometeam, awayteam) = team2
ORDER BY surrogateSort, hometeam,awayteam;
于 2013-11-02T19:55:53.323 回答