Please help on PIOVT query

Question

Hello everyone,
Could anyone please help me to figure out this query......
I have following tables and data
create table code_ref (
ref_id    number,
type_id   number,
name      varchar2(50));
insert into code_ref values(100, 1, 'Part One');
insert into code_ref values(101, 1, 'Part Two');
insert into code_ref values(120, 1, 'Part Three');
insert into code_ref values(125, 1, 'Part Four');
commit;
create table product(
product_id   number,
name         varchar2(50));
insert into product values(1, 'Product 1');
insert into product values(2, 'Product 2');
insert into product values(3, 'Product 3');
commit;
create table product_parts(
product_id   number,
part_id      number,
part_desc    varchar2(50));
insert into product_parts values(1, 100, 'Product 1, Part 1');
insert into product_parts values(1, 120, 'Product 1, Part 3');
insert into product_parts values(2, 100, 'Product 1, Part 1');
insert into product_parts values(2, 101, 'Product 1, Part 2');
insert into product_parts values(2, 120, 'Product 1, Part 3');
insert into product_parts values(3, 101, 'Product 1, Part 2');
commit;I am able to get this output:
select *
from (select product_id, part_id from product_parts group by product_id, part_id)
pivot (count(part_id) for part_id in(100 "Part One", 101 "Part Two", 120 "Part Three", 125 "Part Four"))
order by product_id;
PRODUCT_ID   Part One   Part Two Part Three  Part Four
         1          1          0          1          0
         2          1          1          1          0
         3          0          1          0          0However, since the new PART can be added later on, and must be included in above output, how to write this SELECT. I tried "for part_id in (select......)", it did not work :-(
Thanks in advance!!!

Answer 1

Hi,
Sorry, the exact number of columns produced by any query has to be hard-coded into the query itself.
user489948 wrote:
... However, since the new PART can be added later on, and must be included in above output, how to write this SELECT. I tried "for part_id in (select......)", it did not work :-(Using a sub-query there only works if you're getting XML output. The result set will have a single XMLTYPE column, which may contain any number of elements.
See the following thread for some other work-arounds:
Re: Report count and sum from many rows into many columns