What is the customer first, last name and id with least number of accounts.
SELECT T2.customer_first_name ,  T2.customer_last_name ,  T1.customer_id FROM Accounts AS T1 JOIN Customers AS T2 ON T1.customer_id  =  T2.customer_id GROUP BY T1.customer_id ORDER BY count(*) ASC LIMIT 1
customer with the least number of accounts refers to MIN(COUNT(T1.account_id)); customer first name, last name, and ID refers to T2.customer_first_name, T2.customer_last_name, T1.customer_id;