query: SELECT director FROM Movie WHERE director != "null" GROUP BY director HAVING count(*)  =  1
question: What-all name of all directors that which makes one movie except for director named NULL?
query_toks: SELECT director FROM Movie WHERE director ! = `` null '' GROUP BY director HAVING count ( * ) = 1
query_toks_no_value: select director from movie where director ! = value group by director having count ( * ) = value
question_toks: What-all name of all directors that which makes one movie except for director named NULL?