query: SELECT sum(tours) ,  ranking_date FROM rankings GROUP BY ranking_date
question: Do Find that total number of tours for each ranking date.
query_toks: SELECT sum ( tours ) , ranking_date FROM rankings GROUP BY ranking_date
query_toks_no_value: select sum ( tours ) , ranking_date from rankings group by ranking_date
question_toks: Do Find that total number of tours for each ranking date.