mysql - 查找平均分最高的学生

Question

我尝试了很多但没有成功，我只想显示学生列表中学生的最大平均分，如下表所示。

我的 table

我想要得到如下结果

预期输出

到目前为止我做了什么

SELECT MAX(a.Total_Qty) As TotalMax,a.studentId
FROM(
SELECT AVG( s.marks ) AS Total_Qty,s.studentId
FROM results s
WHERE s.stream = 'Form One'
GROUP BY s.studentId) AS a

Answer 1

内部查询将为您提供每个学生的平均值列表。 然后我们按平均分排序(降序)，最后得到前 1 名(限制 1)

SELECT  a.studentId, a.Total_Qty as MaxAvg
FROM(

   SELECT AVG( s.marks ) AS Total_Qty,s.studentId
   FROM results s
   WHERE s.stream = 'Form One'  
   GROUP BY s.studentId)

 AS a
 Order by a.Total_Qty Desc
 Limit 1

或者:

   SELECT AVG( s.marks ) AS Total_Qty,s.studentId
   FROM results s
   WHERE s.stream = 'Form One'  
   GROUP BY s.studentId
   Order By AVG( s.marks ) Desc
   Limit 1