CREATE TABLE Reservations (firstname VARCHAR(255), lastname VARCHAR(255), Room VARCHAR(255), Rate VARCHAR(255)); CREATE TABLE Rooms (RoomId VARCHAR(255), basePrice VARCHAR(255))
Find the first and last names of people who payed more than the rooms' base prices.
    
SQL: SELECT T1.firstname, T1.lastname FROM Reservations AS T1 JOIN Rooms AS T2 ON T1.Room = T2.RoomId WHERE T1.Rate - T2.basePrice > 0