What are the distinct first names, last names, and phone numbers for customers with accounts?
SELECT DISTINCT T1.customer_first_name ,  T1.customer_last_name ,  T1.phone_number FROM Customers AS T1 JOIN Accounts AS T2 ON T1.customer_id  =  T2.customer_id
distinct = DISTINCT; first names, last names, and phone numbers refers to customer_first_name, customer_last_name, phone_number; customers with accounts refers to JOIN operation on Customers and Accounts tables where customer_id matches;