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 don't need the subquery that finds the maximum value.
Instead, ; you just need the first row after having ordered the rows:

select * 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)
  ORDER BY 4 DESC  -- Added this line
) g
WHERE ROWNUM = 1. -- Added this line