Question

How would I convert the below list into multiple rows based on the qty but grouped by the item?

Current results.

ITEM     QTY
-----    ----
12345     1
12346     2
12347     3

This is the desired results

ITEM     QTY
-----    ----
12345     1
12346     1
12346     1
12347     1
12347     1
12347     1

This is the query

SELECT a.item,sum(b.qty) as qty

FROM table1 a, table2 b 
WHERE a.item_id = b.item_id 
group by a.item
order by a.item_id

Answer 1

You can do this by applying the rownum to the records:

select t1.item, qty / qty as qty
from yourtable t1
left join
(
  select rownum rn, item
  from yourtable
) t2
  on t1.qty >= t2.rn
order by t1.item

see SQL Fiddle with Demo