SELECT in an UPDATE

Hi Friends,
Just wanted to know if there is a better way to write an UPDATE on a table based on the 2 columns from a SELECT statement.
My SELECT goes as below:
SELECT    d.activity_id, sum(a.promo_shipped + a.promo_distro_shipped) sales
    FROM test_sales_hist a,
         ah_store_group_cust b,
         ah_item_xref c,
         ah_activity_external d,
         ah_chain_div_storegroup e,
         ah_div f
   WHERE a.cust_num = b.cust_num
     AND a.entry_dt >= d.activity_start
     AND a.entry_dt <= d.activity_end
     AND a.itm_id_edw = c.item_id_edw
     AND c.item_code_cust = d.item_code_cust
     AND b.store_group = e.store_group
     AND f.division = d.division
     AND e.div_id = f.div_id
     AND (   a.promo_ordered > 0
          OR a.promo_shipped > 0
          OR a.promo_distro_ordered > 0
          OR a.promo_distro_shipped > 0
GROUP BY activity_id;There is SALES column in AH_ACTIVITY_EXTERNAL table.
I want to update the SALES value from the above select query that matches the ACTIVITY_ID in AH_ACTIVITY_EXTERNAL table.
Right now I am thinking to use a BULK COLLECT and fetch all the ACTIVITY_ID's and SALES using the above SELECT query and using a FORALL to update the SALES column in AH_ACTIVITY_EXTERNAL for the matching ACTIVITY_ID.
Any better ideas are highly appreciated.
I am sure there must be a straight forward UPDATE joining the select query above.
Thanks,
Raj.

Ok. I've checked it - it is working.
satyaki>
satyaki>select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - Prod
PL/SQL Release 10.2.0.3.0 - Production
CORE    10.2.0.3.0      Production
TNS for 32-bit Windows: Version 10.2.0.3.0 - Production
NLSRTL Version 10.2.0.3.0 - Production
Elapsed: 00:00:00.01
satyaki>
satyaki>
satyaki>create table frank_o
2 as
3    select empno e_no, comm cc_code
4    from emp;
Table created.
Elapsed: 00:00:00.24
satyaki>
satyaki>desc frank_o;
Name                                      Null?    Type
E_NO                                               NUMBER(4)
CC_CODE                                            NUMBER(7,2)
satyaki>
satyaki>select * from frank_o;
      E_NO    CC_CODE
      9999       3455
      7777       3400
      7521        500
      7566
      7654       1400
      7698
      7782
      7788
      7839
      7844          0
      7876
      E_NO    CC_CODE
      7900
      7902
13 rows selected.
Elapsed: 00:00:00.10
satyaki>
satyaki>
satyaki>create table frank_n
2 as
3    select empno e_no, nvl(comm,rownum) cc_code
4    from emp;
Table created.
Elapsed: 00:00:00.21
satyaki>
satyaki>
satyaki>desc frank_n;
Name                                      Null?    Type
E_NO                                               NUMBER(4)
CC_CODE                                            NUMBER
satyaki>
satyaki>
satyaki>select * from frank_n;
      E_NO    CC_CODE
      9999       3455
      7777       3400
      7521        500
      7566          4
      7654       1400
      7698          6
      7782          7
      7788          8
      7839          9
      7844          0
      7876         11
      E_NO    CC_CODE
      7900         12
      7902         13
13 rows selected.
Elapsed: 00:00:00.28
satyaki>
satyaki>
satyaki>merge into frank_o o
2 using frank_n n
3 on ( o.e_no = n.e_no )
4 when matched then
5    update set o.cc_code = n.cc_code
6 when not matched then
7    insert(o.e_no,o.cc_code) values(n.e_no,n.cc_code)
8    where 1=2;
13 rows merged.
Elapsed: 00:00:01.59
satyaki>
satyaki>select * from frank_o;
      E_NO    CC_CODE
      9999       3455
      7777       3400
      7521        500
      7566          4
      7654       1400
      7698          6
      7782          7
      7788          8
      7839          9
      7844          0
      7876         11
      E_NO    CC_CODE
      7900         12
      7902         13
13 rows selected.
Elapsed: 00:00:00.18
satyaki>
satyaki>
satyaki>commit;
Commit complete.
Elapsed: 00:00:00.04
satyaki>Regards.
Satyaki De.

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