select 来自多个列的最大值 mysql 与相应的列值

Question

我在 MySQL 有一个查询结果，结构如下

 class | eng  | math | sci | ss  | kisw
-------+------------+-------------------
 4N    | 80.2 | 41.2 |96.3 |52.0 | 41.5
 4S    | 52.3 | 45.2 |98.5 |65.2 | 85.3
 5N    | 74.3 | 87.0 |69.9 |74.2 | 84.5
 5S    | 87.5 | 45.6 |72.3 |25.6 | 10.3

上面的查询给出了每个类的科目分数。 我想执行一个查询，该查询将为我提供每个主题的最佳 class。 最终结果应该是这样的：

subject | class | score
--------+-------+-------
eng     | 5S    | 87.5
math    | 5N    | 87.0
sci     | 4S    | 98.5
ss      | 5N    | 74.2
kisw    | 4S    | 85.3

我已经尝试查看这些问题，但没有一个答案解决了为具有相应列值的许多列选择最大值的问题

Select 列的最大值和另一个列的对应值

Answer 1

您可以尝试使用 union all

select 'eng' as subject,class,eng from tablename 
where eng =(select max(eng) from tablename)
union all
select 'math',class,math from tablename 
where math=(select max(math) from tablename)
union all
select 'sci',class,sci from tablename 
where sci=(select max(sci) from tablename)
union all
select 'ss',class,ss from tablename 
where ss=(select max(ss) from tablename)
union all
select 'kisw', class,kisw from tablename 
where kisw=(select max(kisw) from tablename)

Answer 2

SELECT * FROM (SELECT subject, class, score FROM TABLE ) PIVOT (MAX(score) AS max_score FOR (subject) IN ('eng' AS eng, 'math' AS math, 'sci' AS sci, 'ss' as ss , 'kisw' 作为 kisw));