Converting multi-row data to single row

Question

My source table has one or more records with the same id. My destination table only has one record for each id. I wish to combine the records from my source table to my destination table. I think the following query will show what I'm trying to do:
update TARGET_TABLE
set (A)
=
(select (case
when sum(A*FUEL_TYPE_ID) > 2 then 4
else sum(A*FUEL_TYPE_ID)
end)
from SOURCE_TABLE
group by additive_id)
where additive_id = NEW_TABLE.additive_idSince I'm currently limited to Apex SQL Commands, the error information is minimalist:
ORA-01427: single-row subquery returns more than one row
How should I be doing this?

Answer 1

Hi tharpa,
Are u able to relate to this.
create table emp2 as select * from emp;
  update emp2
  set sal=(
              select sum(sal)
               from emp
               group by deptno)
where   empno=7839
-------correct one would be-------
   update emp2 e2
   set sal=(
             select sum(sal)
              from emp e1
              where e1.deptno=e2.deptno
              group by deptno)
    where   empno=7839
     Hope it helps
CKLP
Edited by: CKLP on Apr 11, 2011 5:17 AM