当他们的分数相等时，如何将排名分配给他们分享最高排名的学生？

Question

我有对学生进行排名的代码并且它有效，但不是我想要的——如果两个或更多学生得分相同 score 它不会 rank 他们都在同一个 rank。我希望最终排名是这样的 - 如果两个或更多学生 score 结果相同，我希望他们 rank 在同一个地方，如下所示：

1. miki ==> 97.8
2. lisa ==> 96.1 
2. jack ==> 96.1
4. john ==> 90.7

注意 lisa 和 jack score 相同 (96.1)，并且它给了他们相同的 rank（第 2 个），因此，第 3 个被跳过。约翰排名第四。

当前代码

$student = '10_E';
$first = mysql_query("SELECT * FROM rej_students where student_selected = '$student'");

$teacher = mysql_query("SELECT * FROM teachers WHERE tech_id = '1002'");
$teachers = mysql_fetch_array($teacher);

$avg = mysql_query("SELECT * FROM avgfct_10 order by AVGFCT_10 desc");

$ra = 0; //rank
while ($go = mysql_fetch_array($avg))
{
    if ($go['AVGFCT_10'] != $go['AVGFCT_10'])
    {
        $micky = $ra ++;
    }
    if ($go['AVGFCT_10'] == $go['AVGFCT_10'])
    {
        $micky = 'same';
    }
    echo "id = " . $go['STUDENT_ID'] . "<br> AVARANGE = " . $go['AVGFCT_10'] . "<br>RANK = " . $micky . "<br> Class = " . $teachers['tech_hclass'] . "<br><br>";
}

Answer 1

你需要两个计数器

绝对计数器（总是 1、2、3、4、5 等）。
排名计数器 - 从 1 开始计数，但如果分数相同，则不会更新。一旦分数不同，它就会更新为 absolute counter。

示例代码

$counter = 1; // init absolute counter
$rank = 1; // init rank counter

// initial "previous" score:
$prevScore = 0;
while ($go = mysql_fetch_array($avg))
{
    // get "current" score
    $score = $go['AVGFCT_10'];

    if ($prevScore != $score) // if previous & current scores differ
        $rank = $counter;
    // else //same // do nothing

    echo "Rank: {$rank}, Score: {$score}<br>";
    $counter ++; // always increment absolute counter

    //current score becomes previous score for next loop iteration
    $prevScore = $score;
}

输出：

Rank: 1, Score: 97.8
Rank: 2, Score: 96.1
Rank: 2, Score: 96.1
Rank: 4, Score: 90.7

当他们的分数相等时，如何将排名分配给他们分享最高排名的学生？

How to assign rank to students to where they share the highest rank when their scores equal?

php

mysql

sorting

sql-order-by