What is the customer first, last name and id with the 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
least number of accounts refers to MIN(COUNT(accounts)); customer first name, last name and id refers to selecting customer_first_name, customer_last_name, customer_id;