Can u help me refine this query

Question

create table company
(comp_id number primary key,
comp_name varchar2(50) not null
create table accident
(acc_seq number primary key,
acc_comp_id number not null,
acc_series smallint not null,
acc_id varchar2(10) not null,
acc_type varchar2(50) not null)
-- acc_series is an auto number to tell me total accident this company has so far
insert into company(comp_id,comp_name)
values(10001,'A Corp')
insert into company(comp_id,comp_name)
values(10002,'B Corp')
insert into company(comp_id,comp_name)
values(10003,'C Corp')
insert into accident(acc_seq,acc_comp_id,acc_series,acc_id,acc_type)
values(9001,10001,1,'AC-09-0001','CAR')
insert into accident(acc_seq,acc_comp_id,acc_series,acc_id,acc_type)
values(9002,10002,1,'AC-09-0002','MACHINARY')
insert into accident(acc_seq,acc_comp_id,acc_series,acc_id,acc_type)
values(9003,10001,2,'AC-09-0009','FIELD')
-- problem for this query : I hardcoded number 1,2. In reality, I need a way to find the upper bound first then do the decode ( I think) and adjust the column heading accordingly, can u help ?
select
comp_name,
max(decode(acc_series,1,acc_id)) acc1_id,
max(decode(acc_series,1,acc_type)) acc1_type,
max(decode(acc_series,2,acc_id)) acc2_id,
max(decode(acc_series,2,acc_type)) acc2_type
from company A,accident B
where A.comp_id=B.acc_comp_id
group by comp_name
output
COMP_NAME ACC1_ID ACC1_TYPE ACC2_ID ACC2_TYPE
A Corp      AC-09-0001      CAR      AC-09-0009      FIELD
B Corp      AC-09-0002      MACHINARY
Thanks in advance.
Munshar

Answer 1

It looks like you are after a dynamic pivot.
Check out this post by Frank that goes through an example on how to create a dynamic pivot: {message:id=3227388}