What are the the full names and ids for all customers, and how many accounts does each have?
SELECT T1.customer_id ,  T2.customer_first_name ,  T2.customer_last_name ,  count(*) FROM Accounts AS T1 JOIN Customers AS T2 ON T1.customer_id  =  T2.customer_id GROUP BY T1.customer_id
Tüm müşteriler için tam ad ve kimlikler nelerdir ve her birinin kaç hesabı var?