$field = 'FROM_UNIXTIME(pay_time, "%Y-%m-%d") as day,promote_id,user_id,game_id,server_id,game_player_id,sum(pay_amount) as recharge_cost,count(id) as recharge_count';
$field = 'FROM_UNIXTIME(pay_time, "%Y-%m-%d") as day,promote_id,user_id,game_id,server_id,game_player_id,sum(pay_amount) as recharge_cost,count(id) as recharge_count';