What is the customer last name, id and phone number with most number of orders?
CREATE TABLE Orders (customer_id VARCHAR); CREATE TABLE Customers (customer_last_name VARCHAR, phone_number VARCHAR, customer_id VARCHAR)
[SQL] SELECT T2.customer_last_name, T1.customer_id, T2.phone_number FROM Orders AS T1 JOIN Customers AS T2 ON T1.customer_id = T2.customer_id GROUP BY T1.customer_id ORDER BY COUNT(*) DESC LIMIT 1 [/SQL]