我想按以下两种品质按表订购

Question

Above is the result i am getting by my query

• The output shall be ordered by two different qualities o first, by the number of non-null rankings in descending order o second, by the sum of the rankings, in ascending order

Above image is for what result should look like

Server used: Mysql

this is my query and what i have tried so far any help is greatly appreciated

select 
    snippettitle as category
    , if(cntrank>limitnumber,null,cntrank) as counts
    ,if(viewrank>limitnumber,null,viewrank) as views
    , if(likesrank>limitnumber,null,likesrank) likes
    , if(dislikesrank>limitnumber,null,dislikesrank) dislikes
    ,if(commentrank>limitnumber,null,commentrank) comment_count 
from ( select 
            snippettitle 
            ,RANK() OVER (ORDER BY cnt DESC) AS cntrank 
            ,RANK() OVER (ORDER BY views DESC) AS viewrank 
            ,RANK() OVER (ORDER BY likes DESC) AS likesrank 
            ,RANK() OVER (ORDER BY dislikes DESC) AS dislikesrank 
            ,RANK() OVER (ORDER BY comment_count DESC) AS commentrank 
        from homework7a) tmp 
        where 
            (cntrank <= limitnumber 
            || viewrank <= limitnumber 
            || likesrank <= limitnumber 
            || dislikesrank <= limitnumber 
            || commentrank <= limitnumber
    ) 
order by counts desc,views desc,likes desc ,dislikes desc,comment_count desc;

Answer 1

Your 1st condition:

by the number of non-null rankings in descending order

can be simplified to:

by the number of null rankings in ascending order

So I believe that you want this:

select *
from yourquery
order by 
  (counts is null) + (views is null) + (likes is null) + (dislikes is null) + (comment_count is null), 
  coalesce(counts, 0) + coalesce(views, 0) + coalesce(likes, 0) + coalesce(dislikes, 0) + coalesce(comment_count, 0)