How to use MAX() on a subquery result?

Question

I am new to Oracle and the SQL world. I have a slight issue with a query that I cannot figure out for the life of me, I have spent a few hours trying different approaches and I

Answer 1

You could try something like

 SELECT membership.mem_desc,membership.mem_max_rentals,membership_history.mem_type, membership_count, rank() over ORDER BY membership_count DESC as ranky
from
(Select membership.mem_desc,membership.mem_max_rentals,membership_history.mem_type,      
count(membership_history.MEM_TYPE) as membership_count
from membership_history
JOIN membership ON membership.mem_type = membership_history.mem_type
group by (membership_history.mem_type,membership.mem_desc,membership.mem_max_rentals)
) 
WHERE ranky =1;