query: SELECT StuID FROM Student EXCEPT SELECT StuID FROM Participates_in
question: What are the ids of the students who ain't involved in any activity
query_toks: SELECT StuID FROM Student EXCEPT SELECT StuID FROM Participates_in
query_toks_no_value: select stuid from student except select stuid from participates_in
question_toks: What are the ids of the students who ain't involved in any activity