Question

出于某种原因，我无法提出一些简单的代码。

我想在下面的代码中将'wins'除以'playing'，以便在我的输出中如果你赢了4场比赛中的2场，它会显示为.500？

当然这很简单，一个位置可能很关键，但我无法理解它的生命!!

$result = mysql_query("
    select team, 
    count(*) played, 
    count(case when HomeScore > AwayScore then 1 end) wins, 
    count(case when AwayScore > HomeScore then 1 end) lost, 
    count(case when HomeScore = AwayScore then 1 end) draws,
    sum(HomeScore) ptsfor, 
    sum(AwayScore) ptsagainst,
    sum(HomeScore) - sum(AwayScore) goal_diff, 
    sum(case when HomeScore > AwayScore then 3 else 0 end + case 
    when HomeScore = AwayScore then 1 else 0 end) score     
    from (select 
        HomeTeam team, 
        HomeScore, 
        AwayScore 
    from Game 
        union all 
    select  AwayTeam, 
        AwayScore, 
        HomeScore 
    from Game) a 
    group by team 
    order by wins desc, 
         draws desc,
     lost asc,
     goal_diff desc;");

由于

Answer 1

只需在查询中添加另一个计算列，如下所示：

select team, 
count(*) played, 
count(case when HomeScore > AwayScore then 1 end) wins,
(cast(count(case when HomeScore > AwayScore then 1 end) as decimal(8,2)/cast(count(*) as decimal(8,2)) percentage,
.... -> Rest of the query goes here

由于我假设分数是整数，因此完成了转换。如果没有铸造，将会失去准确性，即2/4将在没有铸造的情况下返回0。

Answer 2

尝试以下查询。这可以利用MySQL的行为自动将boolean表达式转换为int。这意味着没有CASE语句（以可移植性为代价的漂亮查询）。此外，像SUM(3*win + draw) score这样的部分在视觉上看起来更像是你的得分计算公式。没问题计算pct。

SELECT team
     , COUNT(*)  played
     , SUM(win)  wins
     , SUM(loss) lost
     , SUM(win)/count(*) pctWon
     , SUM(draw) draws
     , SUM(SelfScore) ptsfor
     , SUM(OpponentScore) ptsagainst
     , SUM(SelfScore) - SUM(OpponentScore) goal_diff
     , SUM(3*win + draw) score
FROM (
      SELECT team
     , SelfScore
     , OpponentScore
     , SelfScore < OpponentScore win
     , SelfScore > OpponentScore loss
     , SelfScore = OpponentScore draw
      FROM (
        SELECT HomeTeam team, HomeScore SelfScore, AwayScore OpponentScore
        FROM Game
        union all select AwayTeam, AwayScore, HomeScore
        FROM Game
       ) a
) b
GROUP BY team
ORDER BY wins DESC, draws DESC, lost ASC, goal_diff DESC;

MySql为体育联盟划分.pct

2 个答案: