如何计算出了每个人得总分 和总排名，但是如何计算出每一个人在自己学校得排名呢(标签-php|关键词-数组)

php tp5有这样一个数组，多个学校得学生成绩在一哥表中

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我已经计算出了每个人所考总分和总分排名，但是如何计算出每一个人在自己学校得排名呢？

sql写法
SELECT school, name, 
       RANK() OVER (PARTITION BY school ORDER BY a1 DESC) AS a1_rank,
       RANK() OVER (PARTITION BY school ORDER BY a2 DESC) AS a2_rank
FROM scores;
tp写法
$result = Db::table('scores')
    ->field('school, name, RANK() OVER (PARTITION BY school ORDER BY a1 DESC) AS a1_rank, RANK() OVER (PARTITION BY school ORDER BY a2 DESC) AS a2_rank')
    ->order('school')
    ->select();

print_r($result);