Database: customers_and_invoices
Question: What is the customer id, first and last name with most number of accounts.
SQL:
SELECT T1.customer_id ,  T2.customer_first_name ,  T2.customer_last_name FROM Accounts AS T1 JOIN Customers AS T2 ON T1.customer_id  =  T2.customer_id GROUP BY T1.customer_id ORDER BY count(*) DESC LIMIT 1