What is the amount of mailshots that Wendell has?
SELECT count ( * )  FROM mailshot_customers AS T1 JOIN customers AS T2 ON T1.customer_id   =   T2.customer_id where T2.customer_name  =  "Wendell"
amount of mailshots that Wendell has refers to COUNT(*) from a JOIN between mailshot_customers and customers where customer_name = 'Wendell';