mysql - SQL 中的 NHL 排名

标签 mysql sql sorting

我有一个 SQL 查询，它根据旧的 NHL 格式生成球队排名。

代码的第一部分获取每个分区中前 3 名的球队，第二位获取其余的球队，按点数/差异对它们进行排序。

这可以在这里看到:http://rgmgstandings.tk

这是我的 SQL 查询:

("(SELECT *, 1 as `SortKey` from `standings_east` 
        WHERE pts = (select max(pts) 
            from standings_east as t 
    where t.`div` = standings_east.`div`))

UNION ALL 

(select *, 2 as SortKey from `standings_east` 
        where team not in 
            (select team from standings_east 
                where pts = (select max(pts) 
                    from standings_east as t 
                        where t.`div` = standings_east.`div`))) 
        order by SortKey, pts desc, diff desc")

如果您访问我的网站，并查看西部联盟的排名(蓝色横幅)，您会发现“CEN”中的 3 支球队拥有相同的积分(芝加哥、温尼伯、哥伦布)

standings

我希望查询根据“胜/胜”最多的球队从该部门中仅选择一支球队。

正确的排名应该是:

埃德蒙顿(西北)80
阿纳海姆 (PAC) 74
哥伦布 (CEN) 71
达拉斯 (PAC) 73
芝加哥 (CEN) 71
温尼伯 (CEN) 71

我怎样才能做到这一点？

最佳答案

查询

select team,`div`,pts,1 as sortOrder 
from 
(   -- note use parentheses to avoid mysql error 1221
    (select team,`div`,pts,@cen:=team from `standings_west` where `div`='CEN' order by pts desc limit 1) 
    union all 
    (select team,`div`,pts,@pac:=team from `standings_west` where `div`='PAC' order by pts desc limit 1) 
    union all 
    (select team,`div`,pts,@nw:=team from `standings_west` where `div`='NW' order by pts desc limit 1) 
) xDerived1 
cross join (select @cen='',@pac='',@nw='') params 
union 
select team,`div`,pts,sortOrder 
from 
(   select team,`div`,pts,2 as sortOrder 
    from `standings_west` 
    where team!=@cen and team!=@pac and team!=@nw 
    order by pts desc 
    limit 3 
) xDerived2 
order by sortOrder,pts desc;

结果

+----------+-----+-----+-----------+
| team     | div | pts | sortOrder |
+----------+-----+-----+-----------+
| EDMONTON | NW  |  80 |         1 |
| ANAHEIM  | PAC |  74 |         1 |
| WINNIPEG | CEN |  71 |         1 |
| DALLAS   | PAC |  73 |         2 |
| CHICAGO  | CEN |  71 |         2 |
| COLUMBUS | CEN |  71 |         2 |
+----------+-----+-----+-----------+

存储过程

下面描述了一个存储过程，只是为了在您遇到问题并需要它时显示它。

drop procedure if exists xdoit;
delimiter $$
create procedure xdoit()
begin
select team,`div`,pts,1 as sortOrder 
from 
(   -- note use parentheses to avoid mysql error 1221
    (select team,`div`,pts,@cen:=team from `standings_west` where `div`='CEN' order by pts desc limit 1) 
    union all 
    (select team,`div`,pts,@pac:=team from `standings_west` where `div`='PAC' order by pts desc limit 1) 
    union all 
    (select team,`div`,pts,@nw:=team from `standings_west` where `div`='NW' order by pts desc limit 1) 
) xDerived1 
cross join (select @cen='',@pac='',@nw='') params 
union 
select team,`div`,pts,sortOrder 
from 
(   select team,`div`,pts,2 as sortOrder 
    from `standings_west` 
    where team!=@cen and team!=@pac and team!=@nw 
    order by pts desc 
    limit 3 
) xDerived2 
order by sortOrder,pts desc;
end$$
delimiter ;

调用存储过程

call xdoit();

这里有一些评论。

首先，您的 sqlfiddle 有来自西方的数据，但有来自东方的查询。根据表名称，我建议您将所有数据放在一个表中，而不是两个表中，并有一列表示东或西。

该查询使用交叉联接来仅建立用于获取部门领导者的变量，以便那些部门领导者被排除在 sortOrder=2 团队之外。

根据@Clockwork 评论中关于 DIFF 实现的抢七局(即:获得 71 分的球队)进行必要的调整

如果您有任何问题，请询问。

以下是我根据您在聊天室中发布的评论为您提出的 multi_query php 解决方案。

我能想出的唯一解决方案是以下基于显然结果在两个结果集中返回的结果。因此，while 循环由next_result() 驱动。第一个结果集包含前 3 行，第二个结果集包含后面的 12 行。这就是 PHP 的看法。

另请注意，在 PHP 部分中，由于我似乎正在处理 multi_query，因此我利用了这一点并传递了 mysql 参数，而不是进行交叉连接来获取它们。

PHP

<!DOCTYPE html>
<html lang="en">
<head>
  <title>RGMG: Standings</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
  <script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
</head>
<body>

<?php 
    //mysqli_report(MYSQLI_REPORT_ALL);
    mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
    error_reporting(E_ALL); // report all PHP errors
    ini_set("display_errors", 1); 

    try {
        $mysqli= new mysqli('localhost', 'dbUser', 'thePassword', 'theDbName'); 

        echo "<table><div><br><br>";    // note you had this line a little bit wrong


        // notice below the concat of the $sql and the multi_query()
        $sql = "set @cen:='',@pac:='',@nw:=''; ";
        $sql .= "select *
                from
                (   select team,`div`,gp,win,lose,otl,goalsF,goalsA,diff,gpg,gaa,pts,1 as sortOrder 
                    from 
                    (   -- note use parentheses to avoid mysql error 1221
                        (select team,`div`,gp,win,lose,otl,goalsF,goalsA,diff,gpg,gaa,pts,@cen:=team from `standings_west` where `div`='CEN' order by pts desc, win desc, diff desc limit 1) 
                        union all 
                        (select team,`div`,gp,win,lose,otl,goalsF,goalsA,diff,gpg,gaa,pts,@pac:=team from `standings_west` where `div`='PAC' order by pts desc, win desc, diff desc limit 1) 
                        union all 
                        (select team,`div`,gp,win,lose,otl,goalsF,goalsA,diff,gpg,gaa,pts,@nw:=team from `standings_west` where `div`='NW' order by pts desc, win desc, diff desc limit 1) 
                    ) xDerived1 
                    union all
                    select team,`div`,gp,win,lose,otl,goalsF,goalsA,diff,gpg,gaa,pts,sortOrder 
                    from 
                    (   select team,`div`,gp,win,lose,otl,goalsF,goalsA,diff,gpg,gaa,pts,2 as sortOrder 
                        from `standings_west` 
                        where team!=@cen and team!=@pac and team!=@nw 
                        order by pts desc 
                    ) xDerived2
                ) xDerived3 
                order by sortOrder,pts desc";

        echo "<div class='container'>";
        echo "<img src='http://i.imgur.com/sjDHhIV.png' width='100%' alt='West'>";
        echo "<table class='table table-condensed'>
        <tr class='top'>
        <th class='rank'></th>
        <th class='team'>TEAM</th>
        <th>DIV</th>
        <th>GP</th>
        <th>W</th>
        <th>L</th>
        <th class='otl'>OTL</th>
        <th class='pts'>PTS</th>
        <th>GF</th>
        <th>GA</th>
        <th>DIFF</th>
        <th>GPG</th>
        <th>GAA</th>
        ";
        $counter=1;
        $mysqli->multi_query($sql);
        while(true) {
            if ($result = $mysqli->store_result()) {
                while ($row = $result->fetch_assoc()) {
                    $gpg = ($row['goalsF']);
                    $gaa = ($row['goalsA']);

                    if ($row['gp'] != 0 ){
                        $gpg = ($row['goalsF'] / $row['gp']);
                        $gaa = ($row['goalsA'] / $row['gp']);
                    }
                    else {
                        $row['gp'] = "";
                    }

                    echo "<tr>
                        <td class='rank'>" . "$counter" . "</td>
                        <td class='team'>" . $row['team'] . "</td>
                        <td>" . $row['div'] . "</td>
                        <td>" . $row['gp'] . "</td>
                        <td>" . $row['win'] . "</td>
                        <td>" . $row['lose'] . "</td>
                        <td class='otl'>" . $row['otl'] . "</td>
                        <td class='pts'>" . $row['pts'] . "</td>
                        <td>" . $row['goalsF'] . "</td>
                        <td>" . $row['goalsA'] . "</td>
                        <td>" . $row['diff'] . "</td>
                        <td>" . round($gpg, 2) . "</td>
                        <td>" . round($gaa, 2) . "</td>";
                    $counter++;
                }
                $result->free();
            }
            if ($mysqli->more_results()) {
                $mysqli->next_result();
            }                   
            else {
                break;
            }   
        }
        echo "</table></div>";

        $mysqli->close();
    } catch (mysqli_sql_exception $e) { 
        throw $e; 
    }

?>

</body>
</html>

enter image description here

关于mysql - SQL 中的 NHL 排名，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34459660/

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