Using COUNT in GROUP_CONCAT

Question

This is my table:

  id  | fk_company
-------------------
  1   |     2    
  2   |     2    
  3   |     2    
  4   |     4    
  5   |     4    
  6   |     11          


        

Answer 1

select GROUP_CONCAT(counts) 
   from (
      select count(id) counts from
          table group by fk_company
   );