UPDATE with inline view - ORA-01779:cannot modify a column which maps to a

Question

Hello....
With the following SQL, I get the ORA-01779 mentioned in the Subject Line:
update
(select a.old_c1
,a.old_c2
,a.old_c3
,b.old_c1
,b.old_c2
,b.old_c3
from table1 a, table2 b
where a.id = b.id)
set a.old_c1 = b.old_c1
,a.old_c2 = b.old_c2
,a.old_c3 = b.old_c3;
Any help or explanation would be helpful. Thank you.

Answer 1

This does not work either.Works for me:
SQL> select * from table1;
                  ID O O O
                 101 a b c
                 102 d e f
SQL> select * from table2;
                  ID O O O
                 101 x y z
                 103 g h i
SQL> update table1 a
  2  set   (a.old_c1
  3        ,a.old_c2
  4        ,a.old_c3
  5        ) = (select b.old_c1
  6                   ,b.old_c2
  7                   ,b.old_c3
  8             from   table2 b
  9             where  b.id = a.id
10            )
11  where exists
12            (select 1
13             from   table2 b
14             where  b.id = a.id
15            );
1 row updated.
SQL> select * from table1;
                  ID O O O
                 101 x y z
                 102 d e fNeed a little more to go on than "doesn't work".
Are you still getting duplicates in the subquery?