请大家帮我把这一段SQL语句转换成存储过程吧，谢谢大家了

merge into pos_points a
using(select distinct(a.ac_id) ac_id,0 points,to_date(a.opn_date,'yyyymmdd') opn_date,c.br_name opn_br_no,a.name customer_name,d.id_no customer_id, using(select distinc