如何根据MySQL中的计数获得排名

Question

I am getting issue with fetching the rank according to the count.

I have two tables :

1)images
2)images_like

Now if the images_like have no entries then it is showing "NULL" in the ranks. please check the query and output :

SELECT im.id, 
   rank 
FROM   (SELECT image_id, 
               @rownum := @rownum + 1 AS rank, 
               Count(*)               AS cnt 
        FROM   images_like, 
               (SELECT @rownum := 0) r 
        GROUP  BY image_id 
        ORDER  BY `cnt` DESC) AS d 
       RIGHT JOIN images AS im 
               ON d.image_id = im.id 

i need to display 3 not null ....

Thanks in advance !!!!!

Answer 1

Try like this :

SELECT im.id, d.rank  
FROM
(               
    SELECT t.image_id, @rownum := @rownum + 1 AS rank 
    FROM
        (               
          SELECT image_id, 
                 Count(*) AS cnt 
          FROM   images_like
          GROUP  BY image_id 
          ORDER  BY `cnt` DESC) AS d       
        ) t, 
     (SELECT @rownum := 0) r          
) d     
RIGHT JOIN images AS im ON d.image_id = im.id