SELECT policy_type_code FROM available_policies GROUP BY policy_type_code HAVING count(*)  >  4
Find the policy type used by more than 4 customers.
SELECT policy_type_code FROM available_policies GROUP BY policy_type_code HAVING count ( * ) > 4
select policy_type_code from available_policies group by policy_type_code having count ( * ) > value
Find the policy type used by more than 4 customers .