CREATE TABLE customers (customer_details VARCHAR(255), customer_id VARCHAR(255)); CREATE TABLE policies (customer_id VARCHAR(255))
Find the name of the customer that has been involved in the most policies.
    
SQL: SELECT t2.customer_details FROM policies AS t1 JOIN customers AS t2 ON t1.customer_id = t2.customer_id GROUP BY t2.customer_details ORDER BY COUNT(*) DESC LIMIT 1