text: Create table If Not Exists Customers (
    Id   int,
    Name varchar(255)
  );
  Create table If Not Exists Orders (
    Id         int,
    CustomerId int
  );
  Truncate table Customers;
  insert into Customers (Id, Name) values (1, 'Joe');
  insert into Customers (Id, Name) values (2, 'Henry');
  insert into Customers (Id, Name) values (3, 'Sam');
  insert into Customers (Id, Name) values (4, 'Max');
  Truncate table Orders;
  insert into Orders (Id, CustomerId) values (1, 3);
  insert into Orders (Id, CustomerId) values (2, 1);
  
  SELECT C.Name AS Customers
  FROM Customers AS C
  WHERE C.Id NOT IN (SELECT CustomerId FROM Orders);