Context: CREATE TABLE Clients (Customer_Name VARCHAR, Client_ID VARCHAR); CREATE TABLE Bookings (Customer_ID VARCHAR); CREATE TABLE Clients (Customer_Name VARCHAR)
Question: Show the names of all the clients with no booking.
Answer: SELECT Customer_Name FROM Clients EXCEPT SELECT T2.Customer_Name FROM Bookings AS T1 JOIN Clients AS T2 ON T1.Customer_ID = T2.Client_ID