订单while循环数据

我正在做一个排名系统。但我想要的是将结果从最高到最低排序（$kn）。我怎样才能做到这一点？订单while循环数据

include "includes/core.inc.php"; 
require "includes/connect.inc.php"; 

$id = $_GET["id"]; 

$query = "SELECT * FROM submitted WHERE id= '$id'"; 
$query_run = $db->query($query); 
while($row = mysqli_fetch_assoc($query_run)){ 

    $name= $row["name"]; 

    $sql = "SELECT * FROM submitted WHERE name= '$name' AND pending = 'Accept'"; 
    $sql_run = $db->query($sql); 
    $count = $sql_run->num_rows; 

    $nums= "SELECT * FROM ranking WHERE name= '$name'"; 
    $nums_run = $db->query($nums); 
    $num = $nums_run->num_rows; 


    $kn = ($count * 0.4) + (($num * 0.2) * 3); 

    echo '$name'; 
    echo '$kn'; 
}

来源

2016-08-30 Hazelcraft

哪个查询？ 'SELECT * FROM ranking WHERE name ='$ name'ORDER BY rank DESC'假设有一个名为'rank'的列。 http://dev.mysql.com/doc/refman/5.7/en/sorting-rows.html – AbraCadaver

我要按$ kn的值排序 – Hazelcraft

遍历列表并查询每个元素几乎从不是一个好主意。相反，你可以把整个逻辑移到查询，然后有对它进行排序：

$query = 
"SELECT s.name AS name, (cnt_submitted * 0.4) + ((cnt_ranking * 0.2) * 3) AS kn 
FROM  (SELECT name, COUNT(*) AS cnt_submitted 
      FROM  submitted 
      WHERE id = '$id' AND 
        pending = 'Accept' 
      GROUP BY name) s 
JOIN  (SELECT name, COUNT(*) AS cnt_ranking 
      FROM  ranking 
      GROUP BY name) r ON r.name = s.name 
ORDER BY 2 DESC"; 

$query_run = $db->query($query); 
while ($row = mysqli_fetch_assoc($query_run)) { 

    $name = $row["name"]; 
    $kn = $row["kn"]; 

    echo '$name'; 
    echo '$kn'; 
}

注：
的$id变量也许应该是一个绑定变量的prepared statement反对SQL的安全防护装置注射攻击。虽然我把它留在OP中，但这不是问题的关键，我不想增加额外的混淆。

来源

2016-08-30 18:33:59 Mureinik

此查询没有意义（组1行） SELECT name ，COUNT（*）AS cnt_submitted FROM submitted WHERE id ='$ id'AND pending ='Accept'AND GROUP BY name –

@AndrejLudinovskov yipes，在那里有一个冗余的'和'。删除它，感谢您的注意。 – Mureinik

你可以做到这一点也PHP：

$result = []; 
while (...) { 
    ..... 

    $kn = ($count * 4) + (($num * 2) * 30); 
    $result[] = [ 
     'rank' => $kn, 
     'name' => $name 
    ]; 
} 

usort($result, function($a, $b) { 
    return $b['rank'] - $a['rank']; 
});

来源

2016-08-30 18:48:45

订单while循环数据

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