sql把多条结果显示成一条

目前的结果如图显示

我要显示成这样的

2行合并成一行 貌似不需要分组 不用 wm concat 这个函数（记不清了）

我的sql 如下：

 select t.displayname||':' || h.parametervalue as 折扣
  from his_productordericb h
left join   ICBPATTERNPARAMETER   t
on h.icbpatternparameterid=t.icbpatternparameterid
 where h.productorderratepolicyid in
       (select  n.productorderratepolicyid new_id
          from (select 
                       b.productorderid,
                       a.rateplanid,
                       c.description
                  from ProductSpecRatePlanAssoc a
                  left join his_productorder b
                    on b.productspecid = a.productspecid
                  left join rateplan c
                    on a.rateplanid = c.rateplanid
                 where a.productspecid = b.productspecid
                   and a.rateplanid = c.rateplanid
                   and c.rateplanid in (525,
                                        526,
                                        527,
                                        528,
                                        529,
                                        530,
                                        531,
                                        532,
                                        991,
                                        992,
                                        993,
                                        994,
                                        995,
                                        996,
                                        997,
                                        998)
                   and b.productorderid = '8684231') m
          left join his_productorderratepolicy n
            on m.rateplanid = n.rateplanid
           and m.productorderid = n.productorderid
           and n.action = 1)

谢谢大家