CREATE TABLE customers (customer_id VARCHAR(255), customer_name VARCHAR(255)); CREATE TABLE available_policies (policy_type_code VARCHAR(255), policy_id VARCHAR(255)); CREATE TABLE customers_policies (customer_id VARCHAR(255), policy_id VARCHAR(255))
What are all the policy types of the customer that has the most policies listed?
    
SQL: SELECT DISTINCT t3.policy_type_code FROM customers AS t1 JOIN customers_policies AS t2 ON t1.customer_id = t2.customer_id JOIN available_policies AS t3 ON t2.policy_id = t3.policy_id WHERE t1.customer_name = (SELECT t1.customer_name FROM customers AS t1 JOIN customers_policies AS t2 ON t1.customer_id = t2.customer_id GROUP BY t1.customer_name ORDER BY COUNT(*) DESC LIMIT 1)