query: SELECT city_code FROM Student WHERE Fname = "Linda" AND Lname = "Smith";
question: Which city do student Linda Smith live in?
query_toks: SELECT city_code FROM Student WHERE Fname = `` Linda '' AND Lname = `` Smith '' ;
query_toks_no_value: select city_code from student where fname = value and lname = value
question_toks: Which city do student Linda Smith live in?