Untitled

select c.company_code, c.founder,
       count(distinct l.lead_manager_code),
       count(distinct s.senior_manager_code),
       count(distinct m.manager_code),
       count(distinct e.employee_code)
from Company as c 
join Lead_Manager as l 
on c.company_code = l.company_code
join Senior_Manager as s
on l.lead_manager_code = s.lead_manager_code
join Manager as m 
on m.senior_manager_code = s.senior_manager_code
join Employee as e
on e.manager_code = m.manager_code
group by c.company_code, c.founder
order by c.company_code;