$fields='a.id,a.create_time,a.agent_id,a.pay_log_id,a.bargain_id,a.order_id,a.house_id,a.house_address,a.status,b.create_time as disc_time,max(b.id) as two_id';
$fields='a.id,a.create_time,a.agent_id,a.pay_log_id,a.bargain_id,a.order_id,a.house_id,a.house_address,a.status,b.create_time as disc_time,max(b.id) as two_id';