CREATE TABLE services (service_id DECIMAL, service_name TEXT)
CREATE TABLE claims (claim_id DECIMAL, fnol_id DECIMAL, effective_date TIME)
CREATE TABLE available_policies (policy_id DECIMAL, policy_type_code TEXT, customer_phone TEXT)
CREATE TABLE customers (customer_id DECIMAL, customer_name TEXT)
CREATE TABLE customers_policies (customer_id DECIMAL, policy_id DECIMAL, date_opened TIME, date_closed TIME)
CREATE TABLE first_notification_of_loss (fnol_id DECIMAL, customer_id DECIMAL, policy_id DECIMAL, service_id DECIMAL)
CREATE TABLE settlements (settlement_id DECIMAL, claim_id DECIMAL, effective_date TIME, settlement_amount DECIMAL)

What is the name of the customer who has the most policies listed?
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
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 NULLS LAST LIMIT 1