Joindre plusieurs lignes en une seule ligne sans agrégation [Oracle]

Si vous savez que vous avez trois colonnes, énumérez-les et agrégez :

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;

Si vous ne connaissez pas le nombre de colonnes renvoyées, vous devez utiliser SQL dynamique (execute immediate ).