query: SELECT StuID FROM Participates_in INTERSECT SELECT StuID FROM Student WHERE age  <  20
question: Who what being a id them a student them 20 year them old and are a-involved at least one a activity.
query_toks: SELECT StuID FROM Participates_in INTERSECT SELECT StuID FROM Student WHERE age < 20
query_toks_no_value: select stuid from participates_in intersect select stuid from student where age < value
question_toks: Who what being a id them a student them 20 year them old and are a-involved at least one a activity.