排序表

Question

的每一列嘿，我是新来sql/postgreSql。我有一个问题，我想就如何做到这一点提出建议。下面是我给出的表格。

Student Maths Physics Chemistry 
Joe  80  52  69 
Steff 50  90  95 
James 62  98  42 

我需要查询上面的表，以便按照它们的标记以降序排列学生。见下文。

Maths Physcis Chemistry 
Joe  James Steff 
James Steff Joe 
Steff Joe  James 

感谢提前:)

Answer 1

答案的关键是window functions。

with orders as (
    select 
     student, 
     row_number() over (order by maths desc) as m, 
     row_number() over (order by physics desc) as p, 
     row_number() over (order by chemistry desc) as c 
    from ratings 
) 
select 
    m.student as Maths, 
    p.student as Physics, 
    c.student as Chemistry 
from orders as m 
join orders as p on m.m=p.p 
join orders as c on m.m=c.c 
order by m.m;