Question

I am trying to merge two tables using the MERGE statement, is there any way of deleting any records in the merged table that have neither been matched or updated?

logic is:
if matched leave it.
if not matched in source delete.
if not matched in target insert.

I know SQL has source/target matching, has oracle anything similar?

Answer 1

As far as I know there is no (one shot) SQL for this.

In PL/SQL you can do it, for example, in this (somehow ugly) way:

BEGIN

FOR r in (select a1,a2,b1,b2,b.rowid from a full outer join b on a.a1=b.b1)
loop

  if r.a1 is null 
  then 
     delete from b where rowid=r.rowid;
  end if;

  if r.b1 is null
  then 
     insert into b values (r.a1, r.a2);
  end if;

end loop;
END;