Please confirm the update

Question

CREATE TABLE TMP(CODE VARCHAR2(5), ID VARCHAR2(5))
INSERT INTO TMP VALUES('0','1')
INSERT INTO TMP VALUES('000','0')
INSERT INTO TMP VALUES('006','0')
INSERT INTO TMP VALUES('006','1')
CREATE TABLE MAIN(CODE VARCHAR2(5), ID VARCHAR2(5), DC NUMBER)
INSERT INTO MAIN VALUES('0','1',0)
INSERT INTO MAIN VALUES('000','0',0)
INSERT INTO MAIN VALUES('006','0',0)
INSERT INTO MAIN VALUES('006','1',0)
INSERT INTO MAIN VALUES('006','3',0)
INSERT INTO MAIN VALUES('006','4',0)
INSERT INTO MAIN VALUES('0','4',0)
INSERT INTO MAIN VALUES('8','1',0)
I want the column DC to be null in main table for all those ids and codes in tmp table
I gave this:
update main AA set AA.DC = null
where AA.CODE IN (SELECT CODE FROM TMP )
AND AA.ID IN (SELECT ID FROM TMP )
it does give 4 rows updated, but this is just example, i am working on a much bigger table with thousands
of rows, i want the actual combination of id and code to be updated..
example, there may be thousands of rows with id as 1, and code not in 0 and 006, they should not be updated
eg: 8,1,0 row in main table should not be updated/.
will the above update do ?

Answer 1

Just confirming a bit here ;) :
MHO%xe>  select * from tmp;
CODE  ID
0     1
000   0
006   0
006   1
4 rijen zijn geselecteerd.
Verstreken: 00:00:00.29
MHO%xe> select * from main;
CODE  ID            DC
0     1              0
000   0              0
006   0              0
006   1              0
006   3              0
006   4              0
0     4              0
8     1              0
8 rijen zijn geselecteerd.
Verstreken: 00:00:00.37
MHO%xe> update main
  2  set dc = null
  3  where ( id, code ) in ( select id, code
  4                          from tmp
  5                        );
4 rijen zijn bijgewerkt.
Verstreken: 00:00:00.96
MHO%xe> select * from main;
CODE  ID            DC
0     1
000   0
006   0
006   1
006   3              0
006   4              0
0     4              0
8     1              0
8 rijen zijn geselecteerd.
Verstreken: 00:00:00.06
MHO%xe> rollback;
Rollback is voltooid.
Verstreken: 00:00:00.12
MHO%xe> update main a
  2  set a.dc = null
  3  where exists ( select null
  4                 from   tmp b
  5                 where  b.id = a.id
  6                 and    b.code = a.code
  7               );
4 rijen zijn bijgewerkt.
Verstreken: 00:00:00.15
MHO%xe> select * from main;
CODE  ID            DC
0     1
000   0
006   0
006   1
006   3              0
006   4              0
0     4              0
8     1              0
8 rijen zijn geselecteerd.
Verstreken: 00:00:00.06
MHO%xe> rollback;
Rollback is voltooid.
Verstreken: 00:00:00.03
MHO%xe> update main aa
  2  set    aa.dc = null
  3  where  aa.code in (select code from tmp )
  4  and    aa.id in (select id from tmp );
4 rijen zijn bijgewerkt.
Verstreken: 00:00:00.21
MHO%xe> select * from main;
CODE  ID            DC
0     1
000   0
006   0
006   1
006   3              0
006   4              0
0     4              0
8     1              0
8 rijen zijn geselecteerd.
Verstreken: 00:00:00.06
MHO%xe>