Verbinden von 2 Datensätzen über Schnittpunkt

Funktioniert in Oracle 12+.

In 11g können Sie Sammlungselemente mit listagg oder UDF verketten.

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;