複数の行を集計せずに単一の行に結合する [Oracle]

3 つの列があることがわかっている場合は、それらを列挙して集計します。

select max(case when seqnum = 1 then type end) as type1,
       max(case when seqnum = 1 then date end) as date1,
       max(case when seqnum = 1 then amount end) as amount1,
       max(case when seqnum = 2 then type end) as type2,
       max(case when seqnum = 2 then date end) as date2,
       max(case when seqnum = 2 then amount end) as amount2,
       max(case when seqnum = 3 then type end) as type3,
       max(case when seqnum = 3 then date end) as date3,
       max(case when seqnum = 3 then amount end) as amount3       
from (select t.*, rownum as seqnum
      from t
     ) t;
  

 返される列の数がわからない場合は、動的 SQL を使用する必要があります (execute immediate ).