交差点を介して2つのデータセットを結合する

Oracle12以降で動作します。

11gでは、listaggまたはUDFを使用してコレクション要素を連結できます。

with
function collagg(p in sys.ku$_vcnt) return varchar2 is
result varchar2(4000);
begin
  for i in 1..p.count loop result := result || '; ' || p(i); end loop;
  return(substr(result,2));
end;
t(id, name, attr, val) as
( select 1, 'Ford',  'A', 'B' from dual union all
  select 1, 'Ford',  'B', 'C' from dual union all
  select 1, 'Ford',  'C', 'D' from dual union all
  select 2, 'BMW',   'A', 'B' from dual union all
  select 2, 'BMW',   'C', 'D' from dual union all
  select 2, 'BMW',   'F', 'G' from dual union all
  select 3, 'TESLA', 'Z', 'Y' from dual union all
  select 3, 'TESLA', 'E', 'F' from dual union all
  select 3, 'TESLA', 'A', 'B' from dual)
, t0 as
(select id, name, 
        cast(collect(cast(attr||':'||val as varchar2(4000))) as sys.ku$_vcnt) c
   from t t1
  group by id, name)
select t1.id baseid,
       t1.name basename,
       t2.id tgtid,
       t2.name tgtname,
       collagg(t1.c multiset intersect t2.c) matchedon,
       collagg(t1.c multiset except t2.c) baseonly,
       collagg(t2.c multiset except t1.c) tgtonly
  from t0 t1 join t0 t2 on t1.id < t2.id;