query: SELECT Name FROM teacher WHERE Teacher_id NOT IN (SELECT Teacher_id FROM course_arrange)
question: What-all are the names of the teachers whose courses done ain't arranged?
query_toks: SELECT Name FROM teacher WHERE Teacher_id NOT IN ( SELECT Teacher_id FROM course_arrange )
query_toks_no_value: select name from teacher where teacher_id not in ( select teacher_id from course_arrange )
question_toks: What-all are the names of the teachers whose courses done ain't arranged?