query: SELECT count(*) ,  rank FROM captain WHERE age  <  50 GROUP BY rank
question: Count number captain more younger 50 each rank.
query_toks: SELECT count ( * ) , rank FROM captain WHERE age < 50 GROUP BY rank
query_toks_no_value: select count ( * ) , rank from captain where age < value group by rank
question_toks: Count number captain more younger 50 each rank.