CREATE TABLE Reservations (Kids VARCHAR2, LastName VARCHAR2, CheckIn VARCHAR2, FirstName VARCHAR2)

How many kids stay in the room DAMIEN TRACHSEL checked in on Sep 21, 2010?
SELECT Kids FROM Reservations WHERE CheckIn = "2010-09-21" AND FirstName = "DAMIEN" AND LastName = "TRACHSEL"
SELECT "Kids" FROM "Reservations" WHERE "2010-09-21" = "CheckIn" AND "DAMIEN" = "FirstName" AND "LastName" = "TRACHSEL"