Using UPDATE in complex SQL

I wonder if anyone can help with an update..
Image 2 tables: packagetable and parttable
packagetable has component to part relationships, eg:
Package Part
PACK1 PART1
PACK1 PART2
PACK2 PART6
PACK2 PART7
PACK2 PART9
PACK3 PART3
PACK3 PART7
parttable has parts and their price
Part Price
PART1 10
PART2 8
PART3 15
PART6 1
PART7 5
PART9 10
but packages are also stored here as parts and have a price (total of components)
PACK1 18 (10 + 8)
PACK2 16 (1 + 5 + 10)
PACK3 20 (15 + 5)
The actual tables are more complex and include a site, a discount, a qty per package, etc but you get the gist.
I need to update package parts so that they equate to the total of their parts because some package parts have the wrong price.
So I need to say
PACK1 = price of PART1 + price of PART2
PACK2 = price of PART6 + price of PART7 + price of PART9
PACK3 = price of PART3 + price of PART7
The actual SQL to obtain the resultant price is:
select
spp1.parent_part packpart,
(select sp2.list_price from ifsapp.sales_part sp2 where sp2.catalog_no = spp1.parent_part) Current_price,
sum((sp1.list_price - (round(sp1.list_price*(spp1.discount_perc/100),2))) * spp1.qty_per_assembly) Proposed_price
from
ifsapp.sales_part_package spp1,
ifsapp.sales_part sp1
where
spp1.catalog_no=sp1.catalog_no
and
spp1.contract=sp1.contract
and
spp1.contract='OIAMN'
having
sum((sp1.list_price - (round(sp1.list_price*(spp1.discount_perc/100),2))) * spp1.qty_per_assembly)<9999999
group by
spp1.parent_part
This results in this case are:
Package Part     Current          Proposed
123          0.00          4911.90
124          0.00          23450.00
126          0.00          23450.00
128          0.00          23950.00
133          0.00          26975.00
134          1200.00          1249.86
140          0.00          9995.00
144          0.00          9995.00
145          0.00          8995.00
150          9021.00          9994.97
151          0.00          9994.97
152          0.00          8994.97
155          0.00          17895.00
168          0.00          17095.00
Clealry the only two values I really need are Package Part and Proposed value... but how can I update the package part prices using a single SQL statement?

If I interpret your question right,
merge works for you in 9i and 10G:
SQL> select * from emps;
ENAME          DEPTNO       SSAL
SMITH              20
ALLEN              30
WARD               30
JONES              20
MARTIN             30
BLAKE              30
CLARK              10
SCOTT              20
KING               10
TURNER             30
ADAMS              20
JAMES              30
FORD               20
MILLER             10
14 rows selected.
SQL> select * from sals;
ENAME             SAL
SMITH            1000
ALLEN            1800
WARD             1450
JONES            2975
MARTIN           1250
BLAKE            2850
CLARK            2450
SCOTT            3000
KING             5000
TURNER           1500
ADAMS            1100
JAMES            1120
FORD             3000
MILLER           1300
14 rows selected.
SQL> /* In 9i */
SQL> merge into emps
2 using (
3 select e.deptno,sum(s.sal) sm from emps e, sals s
4 where e.ename = s.ename
5 group by e.deptno
6 ) src
7 on (src.deptno = emps.deptno)
8 when matched then
9   update set emps.ssal = src.sm
10 when not matched then
11   insert (emps.deptno) values(0)
12 /
14 rows merged.
SQL>/* In 10G */
SQL> merge into emps
2 using (
3 select e.deptno,sum(s.sal) sm from emps e, sals s
4 where e.ename = s.ename
5 group by e.deptno
6 ) src
7 on (src.deptno = emps.deptno)
8 when matched then
9   update set emps.ssal = src.sm
10 /
14 rows merged.
SQL> select * from emps order by deptno;
ENAME          DEPTNO       SSAL
CLARK              10       8750
KING               10       8750
MILLER             10       8750
SMITH              20      11075
ADAMS              20      11075
FORD               20      11075
SCOTT              20      11075
JONES              20      11075
ALLEN              30       9970
BLAKE              30       9970
MARTIN             30       9970
JAMES              30       9970
TURNER             30       9970
WARD               30       9970
14 rows selected.But it could be better if you changed the structure you were using - you could
pick out package names and price summary in the separate table -
now you packagetable looks as the unnormalized structure which is overloaded
by data.
Rgds.

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